On 11/9/26 14:37, Otto J. Makela wrote:
On 07/11/2026 01.10, Jarland Donnell wrote:
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.
This now also seems to have been noted by media:
https://www.theregister.com/applications/2026/11/09/outlookcom-bounces-legit-emails-as-microsofts-authentication-crackdown-goes-sideways/5308428
Seems they realized their mistake and stopped rejecting yesterday at
roughly 10:30 UTC. Would be nice if Microsoft would actually make a
statement about the whole thing though...
--
BR/Mvh. Dan Malm, Systems Engineer, one.com
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