On 2024-12-24 at 18:10:24 UTC-0500 (Tue, 24 Dec 2024 15:10:24 -0800)
Randy Bush via Postfix-users <ra...@psg.com>
is rumored to have said:

and without 1.3

[...]
2024-12-24T23:09:18.525130+00:00 m0 postfix/smtpd[1379]: Anonymous TLS connection established from mail-eastasiaazrln102210001.outbound.protection.outlook.com[2a01:111:f403:e400::1]: TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits) 2024-12-24T23:09:18.698432+00:00 m0 postfix/smtpd[1379]: disconnect from mail-eastasiaazrln102210001.outbound.protection.outlook.com[2a01:111:f403:e400::1] ehlo=1 starttls=1 quit=1 commands=3

The command summary in the disconnect message explains what happened. The client connected successfully with starttls and issued a normal quit command.

There's nothing technically wrong here, at least not that is diagnosable from your end. MS just does strange things.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo@toad.social and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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