No one wants it to be the permanent solution, and ARC is one alternative proposal. But “From munging”, while ugly and not without down-sides, is something that can be done unilaterally and works. ARC and related mechanisms require widespread adoption in order to be effective.
Barry On Wed, Nov 30, 2022 at 9:03 AM Mark Alley <mark.alley= [email protected]> wrote: > That's a question I've always had on this topic. > > Is 5322.FROM an acceptable long-term workaround for DMARC enforced > domains? The community in general seems to be split on 5322.FROM munging > and it's use in practice. > > On 11/30/2022 12:41 AM, Barry Leiba wrote: > >>> Unless I’m misunderstanding you’re saying those with an > >>> enforcing DMARC policy can’t successfully send to mailing lists. > >>> I’m doing it now so I don’t think DMARC has to stay inert if > >>> mailing lists. That’s a bit of a generalization. > >> _dmarc.marmot-tech.com. 300 IN TXT "v=DMARC1; p=none; > >> rua=mailto:[email protected]; ruf=mailto:[email protected]; > >> fo=1" > >> > >> No, you don’t have an enforcing DMARC policy. But if you did, > >> you would still be able to successfully send to this mailing > >> list, because IETF mailing lists rewrite the From addresses of > >> messages from enforcing domains. > > And for mailing list that don't re-write the From address, the issue > > isn't that the sender can't post. It's that subscribers whose domains > > enforce a "p=reject" policy will not get the posts, and will > > eventually become unsubscribed because of the bounce messages their > > domains generate. Neil wouldn't see the harm: others would. It's > > insidious. > > > > Barry > > > > _______________________________________________ > > Ietf-dkim mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/ietf-dkim > > _______________________________________________ > Ietf-dkim mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/ietf-dkim >
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