Hi,
I see increasing reports that sending from MS365 (and similar) fails
with messages like these:
Server at *.eurprd08.prod.outlook.com returned '550 5.4.318
Message expired, connection reset (SuspiciousRemoteServerError)(450
4.4.318 Connection was
closed abruptly (SuspiciousRemoteServerError))'
Server at XYZ returned '450 4.4.318
Connection was closed abruptly (SuspiciousRemoteServerError)'
There are some pointer that it might be related with TLS and certificates.
Actually there really is for that target a configuration in use that the
MX record name does not match the certificate dn but this was never a
problem so far and I'm not sure if that is causing the issues.
Did MS introduce some feature/setting to do strict checking on TLS
certificate names and MX DNS names?
Thanks,
Wolfgang
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