[pfx] Re: header_checks seems not working

Dear Enrico,


Am 06.05.26 um 10:36 schrieb Enrico Morelli via Postfix-users:
> On Wed, 6 May 2026 10:20:51 +0200 Paul Menzel via Postfix-users wrote:

>> 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.

> The subject is the following:
> 
> Subject: Pulitore WC Più Votato 2025
I thought due to the ù, it’d need to be encoded. Where did you copy this 
from? In Thunderbird you can press Ctrl + u to look at the message 
source. The email should also be stored in some file, and you could look 
into it directly?


Kind regards,

Paul
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