Just today we've seen an error that I've never seen before from Microsoft:
550 5.7.1 Message rejected: Message lacks SPF/DKIM/DMARC Auth Records
(AS9031519)
In each case, the sender domain has correct SPF and DKIM. From what we're
seeing, this just seems to trigger when the sender domain doesn't have a DMARC
record. So I guess DMARC is now a requirement to send mail to Microsoft,
they're pulling a Google and applying it at random, or they've targeted us and
our customers for it.
Just looking for a bit of "Me too" or "We're not seeing that at all." Perhaps
even better, though wishful thinking, would be if anyone has any certain knowledge on it.
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