SPF status pass DMARC status pass DKIM status none ARC status pass Spam Rejected reason: Unknown error: permanent error (550): 5.7.26 Unauthenticated email from microsoft.com is not accepted due to5.7.26 domain’s DMARC policy.
Error when forwarding email for Microsoft Office 365
With a DKIM status of “none”, it means that the message wasn’t DKIM signed.
Microsoft has decided to go with a DMARC policy of “reject” for their domain, and because of that policy, messages that fail email authentication statuses are normally being rejected, exactly as you saw happening here, where Google rejected the message, according to Microsoft’s policy.
Messages that are not DKIM signed (properly) cannot survive the email authentication status and be passing DMARC, after they have been forwarded.
So if you’re 100% sure that this was a good (i.e. legitimate) message that was rejected, then you need to follow Google’s advice from the rejection message:
“Please contact the administrator of microsoft.com domain if this was a legitimate mail.”
Microsoft is the only party that can fix this problem, assuming this was a legitimate message from the microsoft.com domain.
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