Email - Rejecting Email Based on Headers With Postfix

Rejecting Email Based on Headers With Postfix

Postfix has the ability to reject mail based on regular expression matching in the header of the incoming mail message. To enable this, add these lines to main.cf:

header_checks = regexp:/etc/postfix/header_checks
header_checks = pcre:/etc/postfix/header_checks

We stuck these after the alias line. Add the header content matches and actions to header_checks (usually in /etc/postfix) and restart postfix. Here is an example match and action:

/badwordnotallowed/ REJECT No Spam Allowed

The logs will show the email being rejected:

Jul 29 09:18:38 main postfix/cleanup[3479]: E855A5555BA: reject: header Subject:
badwordnotallowed from host.example.com[200.0.1.8]; from=<> to=<host2@example.co
m> proto=ESMTP helo=<host.example.com>: No Spam Allowed

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