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Error messages in /var/log/maillog after uninstallation of Kaspersky Antivirus
Mail configuration is applied to master.cf for alias with "mail services" disabled
DMARC segfault errors in server logs: _mh_fork(): The child process with pid XXXXX killed by signal 11
Messages from whitelisted mail servers are rejected or quarantined by the Postfix mail handlers

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How to enable Postfix debug mode

Updated November 15, 2018 08:59

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 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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