We're seeing exactly the same for a bunch of customers with custom domains here
at Fastmail. Very annoying. I can't see any announcement from Microsoft that
they were going to start requiring this for low-volume domains. It also just
seems pointless: I can see (although don't agree due to the mailing list
problem) requiring all mail to be authenticated with from-aligned SPF or DKIM,
but at that point why require publishing a DMARC policy at all, if they're
essentially ignoring it and treating it as p=reject anyway? All these customers
are sending mail with valid, from-aligned SPF and DKIM, they just don't have a
DMARC policy published.
Cheers,
Neil
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