How To Block Email Using Subject Headers In Postfix
erics, Posted December 7th, 2021 at 12:05:44pm
I needed to block email based on the Subject header.
The solution is simple:
Edit main.cf as root and uncomment or add:
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header_checks = regexp:/etc/postfix/header_checks |
Next, creaate or edit /etc/postfix/header_checks as root and add the following line:
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/subject:\sbad subject text here/ REJECT header_checks NO SPAM ALLOWED /subject:\stest subject text here/ DISCARD header_checks NO SPAM ALLOWED |
Finally, run sudo postfix reload
NOTE: Do NOT add the “i” after the regular expression! It is case-insensitive by default, and adding the “i” will break it!
Categories: How-To's, Technology Block, Check, Checks, Discard, Header, header_checks, headers, howto, PostFix, Reject, Spam, Subject, tips
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