By default Postfix MTA only capture ‘From’ and ‘To’ details in the log file (/var/log/maillog). There are some scenarios where we want that email’s subject should be capture in the maillog. This will very useful for email administrators when performing troubleshooting of problems related with email. There are simple steps to enable logging of the email subject in postfix maillog.
We are assuming that postfix is already up and running and will make below changes.
Step:1 Edit ‘/etc/postfix/main.cf’ file & uncomment below line:#header_checks = regexp:/etc/postfix/header_checks
Step:2 Append the below line in ‘/etc/postfix/header_checks’ [at the bottom]/^Subject:/ WARN
Step:3 Run postmap to apply the new configuration in /etc/postfix/header_checks[root@server1 ~]# postmap /etc/postfix/header_checks
Step:4 Restart or Reload the postfix server[root@server1 ~]# systemctl restart postfix
[root@server1 ~]# postfix reload
Details Guide :https://www.awsmonster.com/2019/08/how-to-enable-logging-of-emails-subject.html
Topic: Enable logging of Email’s Subject Line in Postfix Maillog (Read 12733 times)
