Hello,
Simon Branch via mailop wrote on 24.04.24 at 09:28:
/550 5.7.350 Remote server returned message detected as spam -> 550
5.7.1 [2a01:111:f403:261b::700 19] Gmail has detected that this
message;is likely suspicious due to the very low reputation of the
sending;domain. /
/To best protect our users from spam, the message has been;blocked. For
more information, go to; https://support.google.com/mail/answer/188131
<https://support.google.com/mail/answer/188131>
im8-20020a056214246800b00696b2e6b32asi14453219qvb.337 - gsmtp/
a friend of mine had a similar problem lately. DKIM, SPF, DMARC, PTR
were all set up correctly, no blocklist entry.
He disabled IPv6 delivery to Google and could send his e-mails with
IPv4, so "domain reputation" suggest something that might not be
applicable, as the sending domain per se seemed fine.
I don't know how flexible you are in your configuration with MS365, but
the error message suggests you connect to GMail via IPv6, so maybe the
above helps.
Florian
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