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Zizzencs
Asked: 2010-02-26 09:38:54 +0800 CST

Choose relayhost based on the postfix smtpd instance

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I'd like to setup a postfix host (using RHEL 5.4's default postfix, which is version 2.3) with the following characteristics:

  • an SMTP listener listens on 10.0.0.1:25 and relays all e-mails to 10.0.0.1:2525
  • an SMTP listener listens on 10.0.0.1:2525 and relays all e-mails to 10.0.0.2:25

Basically the challenge here is to use two different relayhosts for the different SMTP listeners.

Is it possible? Is there a better solution to achieve similar behavior?

smtp postfix

1 Answers

  1. Best Answer

    Define the listeners in master.cf with the relay host as a content filter:

    10.1.0.1:25 inet n - - - - smtpd -o content_filter=smtp:[10.0.0.1]:2525

    10.1.0.1:2525 inet n - - - - smtpd -o content_filter=smtp:[10.0.0.2]:25

    I had fun figuring this out!

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