Re: NANOG List posts and DMARC

[Michael Thomas via NANOG <nanog () nanog org>]

On 8/2/22 12:30 PM, Jim Popovitch via NANOG wrote:
> 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 () cmadams net> said:
> > > > Once upon a time, Jared Mauch <jared () 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.
I'm sort of surprised that an org would have p=reject when its users use 
outside mailing lists. Most mailing lists probably don't even have From 
rewriting or the mailing list operator is clueless about the problem. 
(think: non-technical mailing lists).

Mike