CentOS 8.x postfix log email Subject in maillog

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To log email subjects in maillog (Very useful during troubleshooting) use:

1. Edit /etc/postfix/main.cf and uncomment below line:

   header_checks = regexp:/etc/postfix/header_checks

2. Edit /etc/postfix/header_checks and append

   /^Subject:/     WARN

3. Run postmap and restart postfix

   postmap /etc/postfix/header_checks
   systemctl restart postfix

4. Look at /var/log/maillog for subject in the logs

Refer:

• https://www.linuxtechi.com/log-email-subject-maillog/

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