Hi, our help desk has notified me that mails from our SIEVE-based vacation autoresponder aren’t accepted by Microsoft anymore. Microsoft complains about the From address:
"The sender's domain in the 5322.From address doesn't meet the authentication
requirements defined for the sender"
I am guessing that refers to the envelope From, which is <> – as it should be
according to RFC 5230. The header From is using our domain, the outgoing
messages are DKIM-signed, and we have a DMARC policy. Regular messages are
accepted by Microsoft, so my best guess is that the empty envelope From is
causing the problem. Is anybody else seeing this? I don’t see how we can do
anything about that on our end.
Cheers,
Sebastian
--
.:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.13.:.
.:.IT Center University of Cologne (ITCC).:.
.:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
.:. SIP: [email protected] .:.
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