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Date: Thu, 13 Apr 2023 10:50:10 +0200
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To: Andreas Heigl <andreas@heigl.org>, internals@lists.php.net
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Subject: Re: [PHP-DEV] Re: Improving Mailing-List interactions - was:
 [PHP-DEV] Moving PHP internals to GitHub
From: tim@bastelstu.be (=?UTF-8?Q?Tim_D=c3=bcsterhus?=)

Hi

On 4/13/23 10:46, Andreas Heigl wrote:
>> DMARC is less of a concern, because the list apparently already performs
>> DMARC mangling for a policy that is not 'none'
> 
> Apart from (possibly) modifying the body and the subject line which then
> breaks the DKIM signature which then breaks DMARC ;-)
> 

I understand how DKIM and DMARC works. For users with a DMARC policy of 
quarantine or reject the list manager already performs DMARC mangling:

The 'From' header is changed from the original 'From' header and instead 
the list address is put there. Now the DMARC policy of the original 
sender no longer applies and instead the DMARC policy of the list is 
used (which does not exist).

You can see happening with the email from "Mikhail Galanin via 
internals" that was sent roughly 10 minute ago.

Best regards
Tim Dsüterhus