When we upgraded to 8.22 during a recent maintenance (yeah I'm slow) TLS was somehow enabled in SMTP. Several domains that have been trying to send to us since and have been getting TLS handshake errors and were unable to send their email. Eventually it would time out of their queue. More often we got mail from many other places just fine. We don't have a need for TLS and don't have a cert so I am fine with it being off. I am curious as to if the error was entirely ours since so many other emails were able to get through, or if it was the sending MTAs that couldn't overcome the error.
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