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I have a strange message in my Postfix server (on Debian 12) and only when receiving a message from Outlook:

postfix/smtpd[1621610]: connect from mail-vi1eur02olkn2098.outbound.protection.outlook.com[40.92.48.98] postfix/smtpd[1621610]: SSL_accept error from mail-vi1eur02olkn2098.outbound.protection.outlook.com[40.92.48.98]: -1 postfix/smtpd[1621610]: warning: TLS library problem: error:0A000102:SSL routines::unsupported protocol:../ssl/statem/statem_srvr.c:1657: postfix/smtpd[1621610]: lost connection after STARTTLS from mail-vi1eur02olkn2098.outbound.protection.outlook.com[40.92.48.98]

Does anybody have an idea how to fix it?

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    Possible solution: Post in a FreeBSD discussion thread about the same error in Postfix with Outlook connections. Scroll through the whole thread for the context of the fix. Found that thread in a Goo gle search for postfix smtpd 'warning: TLS library problem'. Commented Dec 3, 2023 at 20:24

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I think the error came from the fact that I imposed the usage of TLS 1.3 - changing that to

smtpd_tls_protocols = TLSv1.3, TLSv1.2, !SSLv2, !SSLv3, !TLSv1

solved my problem.

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