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
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