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How to enable Postfix debug mode

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Marc López
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Applicable to:

  • Plesk for Linux

Question

How to enable Postfix debug mode?

Answer

  1. Login to the server over SSH

  2. Execute the following (specifying the required IP addresses and domain names to monitor instead '203.0.113.2' and 'example.com'):

    # postconf debug_peer_level=4

    # postconf debug_peer_list=203.0.113.2,example.com

    Note: No spaces between values in debug_peer_list are allowed.

    To disable debug, run:

    # postconf debug_peer_list=""

OR

  1. Edit the /etc/postfix/master.cf config file, add -v right after "smtpd" in the file, like the following:

    CONFIG_TEXT: smtp inet n - n - - smtpd -v

  2. Apply the new settings:

    # service postfix restart

Additional information

Postfix Debugging Howto

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