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Postfix smtp outgoing load balancing

I got good workaround for balancing smtp outgoing from postfix mailing list archives(not using expensive real load balancer). suppose we have 4 smtp servers for outgoing email, and we need to configure/load balance like this:

Here’s the configuration :

Postfix section

main.cf (smtp lb/load balancer)

Here’s the configuration :

Dns sections.

named.conf

By default relayhost(in main.cf) will listing all available mx on example.com and randomly shuffles mx with equal preference(Postfix client makes a random selection between equal-preference MX hosts), in this case these mx are our smtp backend for balancing outgoing mail.

 

Source : postfix manual (relayhost)

Kaynak site: https://www.kutukupret.com/2009/10/03/postfix-smtp-outgoing-load-balancing/

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