https://interpause.com/api.php?action=feedcontributions&feedformat=atom&user=Andrew 2026-04-04T18:01:10Z User contributions MediaWiki 1.39.5 https://interpause.com/index.php?title=Howto/20250203_Upgrade_Ubuntu_22.04_to_24.04_on_a_dual_boot_computer_with_Windows_11&diff=473 2025-02-03T15:24:38Z

<p>Andrew: </p> <hr /> <div>The upgrade process did not go smoothly as hoped, but here are the problems I had and the workarounds that worked for me:<br /> <br /> ==== Problem #1: do-release-upgrade fails due to thunderbird ====<br /> Remove thunderbird: <br /> &lt;pre&gt;sudo apt-get purge thunderbird*&lt;/pre&gt;<br /> <br /> ==== Problem #2: Ubuntu boots to initramfs screen with error message about device not existing ====<br /> Source: https://askubuntu.com/questions/1533516/ubuntu-24-04-dual-boot-win11-initramfs-error<br /> <br /> 1) Boot to Ubuntu Live USB<br /> <br /> 2) Mount root partition<br /> &lt;pre&gt;<br /> sudo mount /dev/sdb5 /mnt (mine was: sudo mount /dev/nvme0n1p2 /mnt)<br /> sudo mount --bind /dev /mnt/dev<br /> sudo mount --bind /proc /mnt/proc<br /> sudo mount --bind /sys /mnt/sys<br /> sudo chroot /mnt<br /> &lt;/pre&gt;<br /> <br /> 3) Add following lines to /etc/initramfs-tools/modules<br /> &lt;pre&gt;<br /> ufshcd_core<br /> ufshcd_pci<br /> &lt;/pre&gt;<br /> <br /> 4) Rebuild initramfs<br /> &lt;pre&gt; update-initramfs -u -k all &lt;/pre&gt;<br /> <br /> 5) Exit initramfs and rebooot<br /> <br /> ==== Problem #3: Ubuntu does not boot to desktop, but boots to console and network device is disabled ====<br /> <br /> 1) Enable network device and test internet connection<br /> &lt;pre&gt;<br /> sudo dhcpcd<br /> ping 8.8.8.8<br /> &lt;/pre&gt;<br /> <br /> 2) Set nameserver in /etc/resolv.conf<br /> &lt;pre&gt;<br /> nameserver 8.8.8.8<br /> &lt;/pre&gt;<br /> <br /> 3) Re-install Ubuntu desktop and video drivers<br /> &lt;pre&gt;<br /> sudo apt update<br /> sudo apt dist-upgrade<br /> sudo apt auto-remove<br /> sudo apt install --reinstall ubuntu-desktop nvidia-driver-470<br /> &lt;/pre&gt;<br /> <br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20250203_Upgrade_Ubuntu_22.04_to_24.04_on_a_dual_boot_computer_with_Windows_11&diff=472 2025-02-03T15:24:23Z

<p>Andrew: </p> <hr /> <div>The upgrade process did not go smoothly as hoped, but here are the problems I had and the workarounds that worked for me:<br /> <br /> ==== Problem #1: do-release-upgrade fails due to thunderbird ====<br /> Remove thunderbird: <br /> &lt;pre&gt;sudo apt-get purge thunderbird*&lt;/pre&gt;<br /> <br /> ==== Problem #2: Ubuntu boots to initramfs screen with error message about device not existing ====<br /> Source: https://askubuntu.com/questions/1533516/ubuntu-24-04-dual-boot-win11-initramfs-error<br /> <br /> 1) Boot to Ubuntu Live USB<br /> <br /> 2) Mount root partition<br /> &lt;pre&gt;<br /> sudo mount /dev/sdb5 /mnt (mine was: sudo mount /dev/nvme0n1p2 /mnt)<br /> sudo mount --bind /dev /mnt/dev<br /> sudo mount --bind /proc /mnt/proc<br /> sudo mount --bind /sys /mnt/sys<br /> sudo chroot /mnt<br /> &lt;/pre&gt;<br /> <br /> 3) Add following lines to /etc/initramfs-tools/modules<br /> &lt;pre&gt;<br /> ufshcd_core<br /> ufshcd_pci<br /> &lt;/pre&gt;<br /> <br /> 4) Rebuild initramfs<br /> &lt;pre&gt; update-initramfs -u -k all &lt;/pre&gt;<br /> <br /> 5) Exit initramfs and rebooot<br /> <br /> ==== Problem #3: Ubuntu does not boot to desktop, but boots to console and network device is disabled ====<br /> <br /> 1) Enable network device and test internet connection<br /> &lt;pre&gt;<br /> sudo dhcpcd<br /> ping 8.8.8.8<br /> &lt;/pre&gt;<br /> <br /> 2) Set nameserver in /etc/resolv.conf<br /> &lt;pre&gt;<br /> nameserver 8.8.8.8<br /> &lt;/pre&gt;<br /> <br /> 3) Re-install Ubuntu desktop and video drivers<br /> &lt;pre&gt;<br /> sudo apt update<br /> sudo apt dist-upgrade<br /> sudo apt auto-remove<br /> sudo apt install --reinstall ubuntu-desktop nvidia-driver-470<br /> &lt;/pre&gt;</div>

Andrew https://interpause.com/index.php?title=Howto/20250203_Upgrade_Ubuntu_22.04_to_24.04_on_a_dual_boot_computer_with_Windows_11&diff=471 2025-02-03T15:18:14Z

<p>Andrew: Created page with &quot;The upgrade process did not go smoothly as hoped, but here are the problems I had and the workarounds that worked for me: ==== Problem #1: do-release-upgrade fails due to thunderbird ==== Remove thunderbird: &lt;pre&gt;sudo apt-get purge thunderbird*&lt;/pre&gt; ==== Problem #2: Ubuntu boots to initramfs screen with error message about device not existing ==== Source: https://askubuntu.com/questions/1533516/ubuntu-24-04-dual-boot-win11-initramfs-error 1) Boot to Ubuntu Live USB...&quot;</p> <hr /> <div>The upgrade process did not go smoothly as hoped, but here are the problems I had and the workarounds that worked for me:<br /> <br /> ==== Problem #1: do-release-upgrade fails due to thunderbird ====<br /> Remove thunderbird: <br /> &lt;pre&gt;sudo apt-get purge thunderbird*&lt;/pre&gt;<br /> <br /> ==== Problem #2: Ubuntu boots to initramfs screen with error message about device not existing ====<br /> Source: https://askubuntu.com/questions/1533516/ubuntu-24-04-dual-boot-win11-initramfs-error<br /> <br /> 1) Boot to Ubuntu Live USB<br /> <br /> 2) Mount root partition<br /> &lt;pre&gt;<br /> sudo mount /dev/sdb5 /mnt (mine was: sudo mount /dev/nvme0n1p2 /mnt)<br /> sudo mount --bind /dev /mnt/dev<br /> sudo mount --bind /proc /mnt/proc<br /> sudo mount --bind /sys /mnt/sys<br /> sudo chroot /mnt<br /> &lt;/pre&gt;<br /> <br /> 3) Add following lines to /etc/initramfs-tools/modules<br /> &lt;pre&gt;<br /> ufshcd_core<br /> ufshcd_pci<br /> &lt;/pre&gt;<br /> <br /> 4) Rebuild initramfs<br /> &lt;pre&gt; update-initramfs -u -k all &lt;/pre&gt;<br /> <br /> 5) Exit initramfs and rebooot</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=470 2025-02-03T15:03:41Z

<p>Andrew: /* Howtos */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20250203 Upgrade Ubuntu 22.04 to 24.04 on a dual boot computer with Windows 11]]<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all critical files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duply/duplicity for historical file versioning.<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Roundcubemail''' webmail<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, Pydio php filemanager, etc.</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=469 2023-12-12T20:49:43Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). <br /> * Be sure to swap my domains and ISP's smtp server for your own!<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> # you may need to duplicate some parameters from the original mail1 config:<br /> message_size_limit = 30720000<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) (Optional, but recommended) Add postfix restrictions to prevent spam/spoofing using the following guide<br /> * https://wiki.centos.org/HowTos(2f)postfix_restrictions.html<br /> <br /> ; 6) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline and update the MX record accordingly.<br /> * If your mail server manages multiple domains, then you would need update the MX record of each domain and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> * Check the log file at /var/log/mail.log and google any error messages<br /> * Use telnet to test connections: <br /> &lt;pre&gt;<br /> telnet mail2.interpause.com 25<br /> telnet mail1.interpause.com 2025<br /> telnet smtp.ebox.ca 587<br /> &lt;/pre&gt;<br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20120923_Repair_corrupt_MySQL_database_that_won%27t_start&diff=468 2023-12-04T04:56:04Z

<p>Andrew: </p> <hr /> <div>'''Sources''': <br /> * http://dev.mysql.com/doc/refman/5.0/en/myisamchk.html<br /> * http://dba.stackexchange.com/questions/23361/innodb-force-recovery-when-innodb-corruption<br /> <br /> '''Steps'''<br /> * Always check log files first for suggestions, /var/log/mysql/<br /> * Try to repair the database offline, in a shell run:<br /> &lt;pre&gt;<br /> sudo myisamchk --force --update-state --key_buffer_size=64M \<br /> --sort_buffer_size=64M --read_buffer_size=1M \<br /> --write_buffer_size=1M /var/lig/mysql/*/*.MYI<br /> &lt;/pre&gt;<br /> * Reboot and test that the database is online.<br /> * If database still offline, edit /etc/mysql/my.cnf, and add the following line to section [mysqld]<br /> &lt;pre&gt;<br /> innodb_force_recovery = 6 # Should try 1 to 6 in increasing numbers<br /> &lt;/pre&gt;<br /> * Reboot and test that the database is online. Note: Database should be online but the innoDB is still corrupt and must be fixed!<br /> * Create a dump of the sql database<br /> &lt;pre&gt;<br /> sudo mysqldump -u root -p--all-databases &gt; ~/backup.sql<br /> &lt;/pre&gt;<br /> * Delete the ibdata and ib_logfile files<br /> &lt;pre&gt;<br /> sudo rm /var/lib/mysql/ibdata1<br /> sudo rm /var/lib/mysql/ib_logfile*<br /> &lt;/pre&gt;<br /> * Remove the recovery mode, by commenting the previously added line:<br /> &lt;pre&gt;<br /> # innodb_force_recovery = 6 # Should try 1 to 6 in increasing numbers<br /> &lt;/pre&gt;<br /> * Reboot and test that the database is online.<br /> * Restore the dump<br /> &lt;pre&gt;<br /> sudo mysql -u root -p &lt; ~/backup.sql<br /> &lt;/pre&gt;<br /> or from mysql:<br /> &lt;pre&gt;<br /> mysql&gt; source backup.sql<br /> &lt;/pre&gt;</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=467 2023-10-19T12:26:41Z

<p>Andrew: </p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). <br /> * Be sure to swap my domains and ISP's smtp server for your own!<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) (Optional, but recommended) Add postfix restrictions to prevent spam/spoofing using the following guide<br /> * https://wiki.centos.org/HowTos(2f)postfix_restrictions.html<br /> <br /> ; 6) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline and update the MX record accordingly.<br /> * If your mail server manages multiple domains, then you would need update the MX record of each domain and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> * Check the log file at /var/log/mail.log and google any error messages<br /> * Use telnet to test connections: <br /> &lt;pre&gt;<br /> telnet mail2.interpause.com 25<br /> telnet mail1.interpause.com 2025<br /> telnet smtp.ebox.ca 587<br /> &lt;/pre&gt;<br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=466 2023-09-23T04:31:01Z

<p>Andrew: /* Amazing Software */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all critical files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duply/duplicity for historical file versioning.<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Roundcubemail''' webmail<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, Pydio php filemanager, etc.</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=465 2023-09-23T04:30:50Z

<p>Andrew: </p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all critical files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duply/duplicity for historical file versioning.<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Vuze''' for bittorents<br /> * '''Roundcubemail''' webmail<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, Pydio php filemanager, etc.</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=464 2023-09-23T04:28:06Z

<p>Andrew: /* Interpause Services */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all critical files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duply/duplicity for historical file versioning.<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, etc.<br /> <br /> ==== Private Pages ====<br /> * Espace - https://www.interpause.com/espace/</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=463 2023-09-23T00:42:30Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). <br /> * Be sure to swap my domains and ISP's smtp server for your own!<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline and update the MX record accordingly.<br /> * If your mail server manages multiple domains, then you would need update the MX record of each domain and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> * Check the log file at /var/log/mail.log and google any error messages<br /> * Use telnet to test connections: <br /> &lt;pre&gt;<br /> telnet mail2.interpause.com 25<br /> telnet mail1.interpause.com 2025<br /> telnet smtp.ebox.ca 587<br /> &lt;/pre&gt;<br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=462 2023-09-22T15:08:43Z

<p>Andrew: /* Troubleshooting */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). <br /> * Be sure to swap my domains and ISP's smtp server for your own!<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need update the MX record of the addition domains and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> * Check the log file at /var/log/mail.log and google any error messages<br /> * Use telnet to test connections: <br /> &lt;pre&gt;<br /> telnet mail2.interpause.com 25<br /> telnet mail1.interpause.com 2025<br /> telnet smtp.ebox.ca 587<br /> &lt;/pre&gt;<br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=461 2023-09-21T19:39:02Z

<p>Andrew: /* Prerequisites */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). <br /> * Be sure to swap my domains and ISP's smtp server for your own!<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need update the MX record of the addition domains and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> Check the log file at /var/log/mail.log and google any error messages<br /> <br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=460 2023-09-21T19:38:44Z

<p>Andrew: /* Prerequisites */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to swap my domains and ISP's smtp server for your own!<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need update the MX record of the addition domains and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> Check the log file at /var/log/mail.log and google any error messages<br /> <br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=459 2023-09-21T19:36:57Z

<p>Andrew: /* Interpause.com History and Details */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all critical files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duply/duplicity for historical file versioning.<br /> <br /> ==== Interpause Services ====<br /> * Azureus HTML WebUI - https://www.interpause.com:6886/<br /> * Pydio php file manager - https://www.interpause.com/filemanager/ (temporarily offline)<br /> * Roundcubemail webmail - https://www.interpause.com/webmail/ (temporarily offline)<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, etc.<br /> <br /> ==== Private Pages ====<br /> * Espace - https://www.interpause.com/espace/</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=458 2023-09-21T19:36:31Z

<p>Andrew: /* Interpause.com History and Details */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duply/duplicity for historical file versioning.<br /> <br /> ==== Interpause Services ====<br /> * Azureus HTML WebUI - https://www.interpause.com:6886/<br /> * Pydio php file manager - https://www.interpause.com/filemanager/ (temporarily offline)<br /> * Roundcubemail webmail - https://www.interpause.com/webmail/ (temporarily offline)<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, etc.<br /> <br /> ==== Private Pages ====<br /> * Espace - https://www.interpause.com/espace/</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=457 2023-09-21T19:36:19Z

<p>Andrew: /* Interpause.com History and Details */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all files are protected from hard drive failure thanks to the hardware raid controller and are automatically backed up offsite using rsync for mirroring and duplicity for historical file versioning.<br /> <br /> ==== Interpause Services ====<br /> * Azureus HTML WebUI - https://www.interpause.com:6886/<br /> * Pydio php file manager - https://www.interpause.com/filemanager/ (temporarily offline)<br /> * Roundcubemail webmail - https://www.interpause.com/webmail/ (temporarily offline)<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, etc.<br /> <br /> ==== Private Pages ====<br /> * Espace - https://www.interpause.com/espace/</div>

Andrew https://interpause.com/index.php?title=Main_Page&diff=456 2023-09-21T19:33:36Z

<p>Andrew: /* Interpause.com History and Details */</p> <hr /> <div>&lt;big&gt;'''Welcome to Interpause.com'''&lt;/big&gt;<br /> <br /> Interpause is a web and file server that I created for my family and friends to share information and files. - lucky13bbq@interpause.com<br /> <br /> ==== Sponsors ==== <br /> * [http://www.vietasie.ca Voyages Vietasie] - Our recommended travel agency in Montreal (Quebec), Canada.<br /> <br /> ==== Howtos ==== <br /> Disclaimer: My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> * [[Howto/20230921 Use a cheap VPS to bypass ISP blocking of port 25 to postfix mail server]]<br /> * [[Howto/20161028 Enable LTE for Nexus 4 running 5.1.1]]<br /> * [[Howto/20130118 Setup Routed Tun OpenVPN server on Ubuntu 12.04]]<br /> * [[Howto/20120923 Repair corrupt MySQL database that won't start]]<br /> * [[Howto/Setup Postfix + dovecot sasl + dovecot imaps + maildir + virtual accounts + mysql + postfixadmin + PositiveSSL certificate + Roundcube on Ubuntu 10.04]]<br /> * [[Howto/Setup Bridged OpenVPN server on Ubuntu 10.04]]<br /> <br /> ==== Interpause.com History and Details ====<br /> Interpause.com made its humble beginnings on low-end (i.e. cheap) hardware. It was first brought into this world on a second-hand Dell Optiplex Pentium 3 450 Mhz desktop that cost under 200$ circa 2004. <br /> <br /> Its first upgrades would occur in 2008, a big year, as it got not one but two significant upgrades: the P3 was retired in favor of a Intel Pentium Dual E2160 @ 1.80Ghz processor, a new 20-bay 4U rackmount case as well as an Adaptec 31605 16-port raid controller. <br /> <br /> The next upgrades would be at the end of 2011/start of 2012 with another two significant upgrades: 1) the retirement of the E2160 in favor of a Intel i5-2400S Processor @ 2.5 Ghz and RAM totaling 8 GB of Dual Channel DDR3 RAM, 2) a software paradigm shift to Proxmox virtualization.<br /> <br /> Today, Interpause.com operates over a residential (40Mbps down/60Mbps up) FTTH connection. Using the Proxmox virtualization platform, the latest flavors of Ubuntu LTS are used for the various guest OSes. All services run off the guest OSes and all files are protected from hard drive failure thanks to the raid controller and are automatically synced to backup servers offsite.<br /> <br /> ==== Interpause Services ====<br /> * Azureus HTML WebUI - https://www.interpause.com:6886/<br /> * Pydio php file manager - https://www.interpause.com/filemanager/ (temporarily offline)<br /> * Roundcubemail webmail - https://www.interpause.com/webmail/ (temporarily offline)<br /> <br /> ==== Amazing Software ====<br /> Nothing beats free software that works, thank you to all the developers that make such software possible.<br /> * '''Parted Magic''' for its numerous utilities including '''Gparted''' for resizing partitions and '''Clonezilla''' for cloning hard drives<br /> * '''UNetbootin''' for booting off USB keys instead of CDs<br /> * Azureus/'''Vuze''' for making such an amazing bittorrent client<br /> * '''Memtest86+''' and '''Prime95''' for helping me isolate hardware failures<br /> * '''Proxmox VE''' for the incredible bare metal hypervisor virtualization environment.<br /> * '''Virtualbox''' for an impressive virtualization software package.<br /> * '''ISPConfig''' for the central dashboard that configures dedicated web, mail and db servers<br /> * '''Ubuntu''' for the OS that drives this server.<br /> * '''Many Others:''' Apache http/https server, Postfix server with Dovecot imaps, OpenSSH, Samba, PXE and TFTP, VNC, OpenVPN, rsync, NFS, MySQL server with phpMyAdmin access, etc.<br /> <br /> ==== Private Pages ====<br /> * Espace - https://www.interpause.com/espace/</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=455 2023-09-21T19:32:30Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need update the MX record of the addition domains and append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> Check the log file at /var/log/mail.log and google any error messages<br /> <br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=454 2023-09-21T19:16:54Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately to relay_domains and possibly elsewhere too (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> Check the log file at /var/log/mail.log and google any error messages<br /> <br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=453 2023-09-21T19:16:25Z

<p>Andrew: </p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately to relay_domains and possibly elsewhere (interpause.com, interpause2.com, interpause3.com, etc.).<br /> <br /> === Troubleshooting ===<br /> Check the log file at /var/log/mail.log and google any error messages<br /> <br /> Good luck!</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=452 2023-09-21T19:14:49Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> ; 5) Reboot both servers mail1 and mail2, or restart postfix<br /> &lt;pre&gt;<br /> sudo service postfix restart<br /> &lt;/pre&gt;<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately to relay_domains and possibly elsewhere (interpause.com, interpause2.com, interpause3.com, etc.).</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=451 2023-09-21T19:12:09Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately to relay_domains and possibly elsewhere (interpause.com, interpause2.com, interpause3.com, etc.).</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=450 2023-09-21T19:02:03Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately (interpause.com, interpause2.com, interpause3.com, etc.).</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=449 2023-09-21T19:01:07Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately.</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=448 2023-09-21T19:00:15Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> === Final Remarks ===<br /> * We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. <br /> * If you have multiple VPSes available, then you may also setup additional mail forwarders as backup (mail3, mail4, etc.) in case mail2 goes down/offline for an extended period of time.<br /> * If your mail server manages multiple domains, then you would need to append the virtual domains appropriately.</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=447 2023-09-21T18:45:47Z

<p>Andrew: /* Final Remarks */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> === Final Remarks ===<br /> We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to the safety of the primary mail1 server. If your mail server manages multiple domains, then you would need to append the virtual domains appropriately.</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=446 2023-09-21T18:45:30Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com<br /> <br /> === Final Remarks ===<br /> We like this solution because all our mail data and accounts remains safe and sound on our primary mail server. Cheap VPS providers can always go bankrupt with very short notice (happened to us twice so far over the many years). Mail may queue briefly on the cheap VPS mail2 server, but will soon get forwarded to mail1. If your mail server manages multiple domains, then you would need to append the virtual domains appropriately.</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=445 2023-09-21T18:39:40Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward unblocked external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=444 2023-09-21T18:38:59Z

<p>Andrew: /* Prerequisites */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS (mail2.interpause.com) and have installed postfix using the default configuration<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=443 2023-09-21T18:38:08Z

<p>Andrew: /* Solution */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=442 2023-09-21T18:21:02Z

<p>Andrew: /* Solution */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP) and internal port 25. We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> * Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=441 2023-09-21T18:20:52Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP) and internal port 25. We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=440 2023-09-21T18:20:29Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP) and internal port 25. We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=439 2023-09-21T18:20:04Z

<p>Andrew: /* Solution */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP) and internal port 25. We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder.<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=438 2023-09-21T18:18:09Z

<p>Andrew: /* Solution */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 (not blocked by ISP) and internal port 25. We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=437 2023-09-21T18:16:03Z

<p>Andrew: /* Prerequesites */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequisites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=436 2023-09-21T18:06:38Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [mail1.interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=435 2023-09-21T18:05:04Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;<br /> <br /> ; 4) Update port forwarding on router<br /> * Forward external port 2025 to internal port 25 of mail1.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=434 2023-09-21T18:03:45Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup /etc/postfix/main.cf on mail1.interpause.com <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> mynetworks = 127.0.0.0/8 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> relayhost = [smtp.ebox.ca]:587<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup /etc/postfix/main.cf on mail2.interpause.com<br /> &lt;pre&gt;<br /> myhostname = mail2.interpause.com<br /> mydestination = $myhostname, localhost, localhost.localdomain, localhost<br /> relayhost = [interpause.com]:2025<br /> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mail1.interpause.com mail2.interpause.com<br /> smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination<br /> relay_domains = $mydestination, interpause.com<br /> relay_recipient_maps =<br /> &lt;/pre&gt;</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=433 2023-09-21T17:59:47Z

<p>Andrew: /* Prerequesites */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server (mail1.interpause.com) configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration (mail2.interpause.com)<br /> * You have access to your ISP's smtp server (smtp.ebox.ca on port 587). Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup mail1.interpause.com to use the ISP's smtp server for inbound emails and accept connections from the VPS for inbound emails<br /> <br /> TODO: IN PROGRESS<br /> <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> relayhost = smtp.ebox.ca<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup mail2.interpause.com<br /> <br /> TODO: IN PROGRESS</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=432 2023-09-21T16:56:35Z

<p>Andrew: </p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration<br /> * For us, the main mail server is located at mail1.interpause.com, the cheap VPS is at mail2.interpause.com, and our ISP's smtp server is smtp.ebox.com. Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup mail1.interpause.com to use the ISP's smtp server for inbound emails and accept connections from the VPS for inbound emails<br /> <br /> TODO: IN PROGRESS<br /> <br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> relayhost = smtp.ebox.ca<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup mail2.interpause.com<br /> <br /> TODO: IN PROGRESS</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=431 2023-09-21T15:10:19Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration<br /> * For us, the main mail server is located at mail1.interpause.com, the cheap VPS is at mail2.interpause.com, and our ISP's smtp server is smtp.ebox.com. Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this:<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup mail1.interpause.com to use the ISP's smtp server for inbound emails and accept connections from the VPS for inbound emails<br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> relayhost = smtp.ebox.ca<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup mail2.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=430 2023-09-21T15:10:05Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration<br /> * For us, the main mail server is located at mail1.interpause.com, the cheap VPS is at mail2.interpause.com, and our ISP's smtp server is smtp.ebox.com. Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> For namecheap, it looks like this: &lt;br&gt;<br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup mail1.interpause.com to use the ISP's smtp server for inbound emails and accept connections from the VPS for inbound emails<br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> relayhost = smtp.ebox.ca<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup mail2.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=429 2023-09-21T15:09:26Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration<br /> * For us, the main mail server is located at mail1.interpause.com, the cheap VPS is at mail2.interpause.com, and our ISP's smtp server is smtp.ebox.com. Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> ; 1) Setup MX records on domain provider to point to VPS<br /> * For namecheap, it looks like this: <br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> ; 2) Setup mail1.interpause.com to use the ISP's smtp server for inbound emails and accept connections from the VPS for inbound emails<br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> relayhost = smtp.ebox.ca<br /> &lt;/pre&gt;<br /> <br /> ; 3) Setup mail2.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=428 2023-09-21T15:08:59Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Prerequesites ===<br /> * You already have a working email server configured with postfix, but port 25 is completely blocked<br /> * You have rented a cheap VPS and have installed postfix using the default configuration<br /> * For us, the main mail server is located at mail1.interpause.com, the cheap VPS is at mail2.interpause.com, and our ISP's smtp server is smtp.ebox.com. Be sure to switch these for your own domain addresses.<br /> <br /> === Steps ===<br /> <br /> # Setup MX records on domain provider to point to VPS<br /> #* For namecheap, it looks like this: <br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> # Setup mail1.interpause.com to use the ISP's smtp server for inbound emails and accept connections from the VPS for inbound emails<br /> &lt;pre&gt;<br /> myhostname = mail1.interpause.com<br /> mydestination = mail1.interpause.com, localhost, localhost.localdomain<br /> relayhost = smtp.ebox.ca<br /> &lt;/pre&gt;<br /> <br /> # Setup mail2.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=427 2023-09-21T14:40:25Z

<p>Andrew: /* Solution */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS whose port 25 is open to receive and then forward emails to the main mail server on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Steps ===<br /> <br /> # Setup MX records on domain provider to point to VPS (mail2.interpause.com)<br /> #* For namecheap, it looks like this: <br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> # Setup main mail server (mail1.interpause.com)<br /> <br /> <br /> # Setup main mail server (mail1.interpause.com) to allow connections from mail2.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=426 2023-09-21T14:40:07Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS (mail2.interpause.com) whose port 25 is open to receive and then forward emails to the main mail server (mail1.interpause.com) on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Steps ===<br /> <br /> # Setup MX records on domain provider to point to VPS (mail2.interpause.com)<br /> #* For namecheap, it looks like this: <br /> [[File:NamecheapMXRecord.gif | 800px]]<br /> <br /> # Setup main mail server (mail1.interpause.com)<br /> <br /> <br /> # Setup main mail server (mail1.interpause.com) to allow connections from mail2.interpause.com</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=425 2023-09-21T14:36:55Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS (mail2.interpause.com) whose port 25 is open to receive and then forward emails to the main mail server (mail1.interpause.com) on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Steps ===<br /> <br /> # Setup MX records on domain provider to point to VPS (mail2.interpause.com)<br /> #* For namecheap, it looks like this: <br /> [[File:NamecheapMXRecord.gif | 800px]]</div>

Andrew https://interpause.com/index.php?title=Howto/20230921_Use_a_cheap_VPS_to_bypass_ISP_blocking_of_port_25_to_postfix_mail_server&diff=424 2023-09-21T14:36:36Z

<p>Andrew: /* Steps */</p> <hr /> <div>=== Disclaimer ===<br /> My Howtos are mainly for me to document the steps required in case I ever have to re-do them again. Hopefully they will help other system admins out there, but I regret that this is not my primary objective.<br /> <br /> === Problem ===<br /> We just switched to a new Internet Service Provider (ISP) that blocks port 25, both ways, making us no longer able to send or receive emails.<br /> <br /> === Solution ===<br /> * For outbound emails, use the ISP's smtp server to send emails.<br /> * For inbound emails, use a cheap VPS (mail2.interpause.com) whose port 25 is open to receive and then forward emails to the main mail server (mail1.interpause.com) on external port 2025 and internal port 25 (not blocked by ISP). We already have a cheap VPS for our OpenVPN server with racknerd that costs 11USD/year so, for us, there is no extra cost to setup this mail forwarder. Our solution is based on the following guide to setup a backup MX: https://www.howtoforge.com/postfix_backup_mx<br /> <br /> === Steps ===<br /> <br /> # Setup MX records on domain provider to point to VPS (mail2.interpause.com)<br /> #* For namecheap, it looks like this: <br /> [[File:NamecheapMXRecord.gif | 600px]]</div>

Andrew