Backup MX with Postfix

[ Thanks to Andrew Weber for this link. ]

"The primary goal of a backup machine for Postfix is that if the first one fails, mail will be collected by the secondary mail server until the primary mail server is back online. When you build the Backup MX be sure to install all of the necessary applications to scan for viruses and check for SPAM as you do not want to overload the primary machine once it comes online.

"DNS Records for example.com would look like this:

IN MX 10 mail.example.com.
 IN MX 20 mail2.example.com.

"In the illustration you can see that when the primary mail server is unavailable, automatically the mail will be sent to secondary machine which will hold all mail in the queue until the primary server is online."

Complete Story

Related Stories:

• Securing PostfixAdmin(Feb 12, 2010)
• Spamassassin Whitelists(Jan 04, 2010)
• Setup Vacation Messages with PostfixAdmin(Dec 30, 2009)
• PostfixAdmin on Ubuntu 9.10(Dec 17, 2009)
• The Perfect Server - OpenSUSE 11.2 x86_64 [ISPConfig 3](Dec 06, 2009)
• Forwarding a Postfix Virtual Alias to /dev/null(Oct 23, 2009)
• ClamAV 0.94.x end of life - with prejudice(Oct 07, 2009)