Postfix – Enable logging of email’s subject in maillog

http://www.linuxtechi.com/log-email-subject-maillog

By default postfix 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. In this article we will discuss how to achieve this :

We are assusming 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’

/^Subject:/     WARN

 
Step:3 Restart the postfix server
#service postfix restart
#postmap /etc/postfix/header_checks
 
Step:4 Now do testing and send a test mail & see the logs

As we can see above , that info user has send email to gmail id with the subject "Linux Interview Call Details" .
Now see the maillogs using the command 'tailf /var/log/maillog'