Hey folks,

We're in the process of trolling all our logs to figure out what we can 
ignore/filter/take action on, and we have a couple entries that I'm wondering 
what's happening under the hood:

2025-05-18T15:42:07+00:00 post.dayjob.org postfix/smtpd [mail.warning] warning: 
TLS library problem: error:0A0000C1:SSL routines::no shared 
cipher:/usr/src/crypto/openssl/ssl/statem/statem_srvr.c:1742:

And

2025-05-19T08:20:09+00:00 amstel.dayjob.org postfix/smtpd [mail.warning] 
warning: TLS library problem: error:0A000412:SSL routines::sslv3 alert bad 
certificate:/usr/src/crypto/openssl/ssl/record/rec_layer_s3.c:1605:SSL alert 
number 42

They're probably harmless, but I am sort of interested in what would make these 
happen?

-Dan
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