[pfx] Re: header_checks seems not working

Dear Enrico,


Am 06.05.26 um 10:13 schrieb Enrico Morelli via Postfix-users:

> I've a Debian 11 mail server with Postfix 3.5.25.  I've configured
> Postfix to filter the headers with: header_checks = pcre:/etc/
> postfix/header_checks.pcre
> 
> However, some emails with subjects listed in the file are still
> delivered.
> 
> E.g.>
> /^Subject:.*Pulitore.WC.Più.Votato.2025.*/ REJECT
> 
> A positive test result:
> 
> postmap -q "Subject: Pulitore WC Più Votato 2025" pcre:/etc/postfix/header_checks.pcre
> REJECT
> 
> Why Postfix don't reject the email? Where I've to investigate? After
> writing a new entry in header_checks.pre, have I to reload Postfix?

Please look at and share the actual header entry Subject in the emails. 
Often they are encoded, and Postfix header checks don’t decode it. You 
need to use a milter for this usecase.


Kind regards,

Paul
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