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How to enable Postfix debug mode

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Marc López
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Plesk for Linux kb: how-to ABT: Group B

Applicable to:

  • Plesk for Linux

Question

How to enable Postfix debug mode?

Answer

It can be done by either one of the following processes:

Click on a section to expand

Via postconf utility

  1. Login to the server over SSH

  2. Execute the following (specifying the required IP addresses and/or recipient 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=""

Editting the master.cf file

  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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