Postfix Log Add Email Subject

Basically, Zimbra and Postfix have fundamental similarities. Zimbra uses Postfix as the main engine Mail Transport Agent (MTA). So in this article it is not much different from how to add an Email Subject in Zimbra which I have been written before. In this post, i will explain easy add email subject in postfix log.

By default Postfix only capture ‘from’ and ‘to’ details in the log file (/var/log/maillog).

Step #1 Open main.cf Postfix Configuration

First, with our favourit editor, open postfix configuration.

vim /etc/postfix/main.cf

Add this line parameter header_checks.

header_checks      = regexp:/etc/postfix/header_checks

The result, like this. Focus just in line header_checks.

Step #2 Create file /etc/postfix/header_checks

vim /etc/postfix/header_checks

Add this line code.

/^Subject:/     WARN

And then, postmap.

postmap /etc/postfix/header_checks

Restart Service Postfix

Last step, restart postfix service.

systemctl restart postfix
postfix reload

Just it, a short article about add email subject in postfix log. I hope it is useful. Please feel free for comment.