Tobi via mailop skrev den 2026-06-29 08:25:
Hi there
in the last days we're seeing that Microsoft is using
"forms.mail.microsoft" as envelope SMTP sender-domain. As this domain
does neither have A or MX it's considered unresolvable by our postfix
MTA. Anyone else seeing that domain in their mailflow?
Any chance that MS will see that and fix it? :_)
as good as rfc 7505 :=)
i still not seem them here yet
but microsoft is allow all kinds of spams
and seen there ARC results with all none, pure spam
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