Setup Postfix to Listen on an Additional SMTP Port

Jun 27

wingloonLinux 2 Comments

This setup will help you to configure Postfix to listen to an additional SMTP port. This enables your SMTP client to access your Postfix SMTP server using other port number when your ISP is blocking the access to any server listening on SMTP port 25.

1. Edit this file /etc/postfix/master.cf and add an entry like below causes Postfix to listen to port 2525: -

2525 inet n - n - - smtpd

2. Then, restart your Postfix service as below: -

service postfix restart

Note: The above was tested on Postfix 2.3.3-2 in CentOS 5

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2 Comments (+add yours?)

  1. simon
    Jun 28, 2009 @ 10:57:56

    Whew..just 2 steps and its done, but does it still accepting connection from port 25 as well?

  2. wingloon
    Jun 29, 2009 @ 08:32:25

    simon, it does accept the default SMTP port 25 too.

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