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How to enable Postfix debug mode

Updated May 28, 2020 13:31

Plesk for Linux kb: how-to

Applicable to:

Plesk for Linux

Question

How to enable Postfix debug mode?

Answer

Login to the server over SSH
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=""

OR

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
Apply the new settings:

# service postfix restart

Additional information

Postfix Debugging Howto

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