NANOG List posts and DMARC

Jim Popovitch jimpop at domainmail.org
Tue Aug 2 19:30:58 UTC 2022


On Tue, 2022-08-02 at 11:24 -0700, Michael Thomas via NANOG wrote:
> On 8/2/22 11:18 AM, Chris Adams via NANOG wrote:
> > Once upon a time, Chris Adams <cma at cmadams.net> said:
> > > Once upon a time, Jared Mauch <jared at puck.nether.net> said:
> > > > Can someone flip the option in Mailman for DMARC please, it’s problematic as if one posts and does DMARC and has feedback on, our messages are  possibly rejected, and the feedback from a post is quite large.
> > > The list is doing the DMARC handling (From rewrite) for senders with a
> > > DMARC p=reject.
> > Oh, or someone just changed the config per your request. :)  I have
> > p=none but my From got rewritten on this message.
> 
> I think it's been doing this for ages. It was the first time I'd seen 
>  From rewriting in the wild iirc.

It's been doing it for ages for p=reject, but not p=none (the latter
being Jared's situation)

There are toggles in MM2 to do DMARC address rewriting for p=none and
p=quarantine in addition to p=reject.

-Jim P.



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