Re: Applying patches from mailing list

"Kevin J. McCarthy" <[email protected]> Sun, 15 Feb 2026 09:52:32 +0800

Newsgroups	gmane.mail.mutt.devel
Message-ID	<aZEm4F-Hw3m-VW1L@qinghai>

On Sat, Feb 14, 2026 at 11:55:07AM +0000, Crystal Kolipe via Mutt-dev wrote:
>On Sat, Feb 14, 2026 at 11:35:03AM +0800, Kevin J. McCarthy wrote:
>> Now that we're back to applying patches from the mailing list, I have a
>> question about technique.
>>
>> The Mutt mailing lists have "dmarc_moderation_action" set to "Munge From",
>> which means when a sender's domain has a DMARC Reject/Quarantine Policy set,
>> the mailing list rewrites the From address.
>>
>> Without this, a fair number of receivers bounce the message, which ends up
>> unsubscribing them eventually.
>
>If the senders are including valid DKIM headers, and the MX of the subscribers
>is capable of verifying them, then the messages should pass DMARC Reject.

It's been a while.  At the time, it may have been that the return-path 
header or another such header that is modified by Mailman, was signed by 
various senders' DKIM.  I didn't realize the problem until I got a very 
large number of admin bounce emails and mass unsubscribes started 
happening.

However, it looks like at some point subsequent to that, OSUOSL added 
filters:

DMARC-Filter: OpenDMARC Filter v1.4.2 smtp4.osuosl.org 62BE640969 
DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 62BE640969

Perhaps the problem is no longer present.

I will try turning off of the munging for the mutt-dev mailing list 
right after I send this, and let's see what happens.  Crystal and Alex, 
if things go silent after this email, please let me know and I'll try 
something else.

-- 
Kevin J. McCarthy
GPG Fingerprint: 8975 A9B3 3AA3 7910 385C  5308 ADEF 7684 8031 6BDA

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