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Alastair Irvine
Asked: 2015-09-28 09:25:42 +0800 CST

postfix: Show destination port for incoming connection in the logs

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I have Postfix listening on several ports for incoming mail. E.g. ports 25 and 587. I'd like to see in the logs the destination port of each incoming connection.

postfix

1 Answers

  1. Use syslog_name in the smtpd options in /etc/postfix/master.cf. This changes the name of the process in the standard-format log line. The default is postfix/smtpd. So to change it for the submission line (port 587), add this to the options:

    -o syslog_name=postfix-submission

    Note that the default process name is kept as a prefix. Don't include "/smtpd" because this is added automatically.

    Example default log line:

    Sep 28 01:22:28 XXXXXX postfix/smtpd[11737]: connect from unknown[203.194.109.130]

    Example "augmented" log line:

    Sep 28 01:22:28 XXXXXX postfix-submission/smtpd[11737]: connect from unknown[203.194.109.130]

    Warning: Do not change this option in /etc/postfix/main.cf, or it will change the output for all of Postfix's listening ports.

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