Emails stopped working, failing after upgrade

After upgrading to 2.9.0 beta4, our emails started failing.

Is there a major change to cause that? It seems the issue is with SSL?
We use Ehlo as SMTP to HTTP gateway

The site is fully SSL but we need the SMTP client side of discourse to be non-SSL for this to work. It’s been working perfectly for the past 2 years until this upgrade.

Anything that can cause that? I’ve spent hours trying to find a solution on existing posts but couldn’t find anything.

discourse-ubuntu:~$ /usr/local/bin/ehlo -p 2525 -a
2022-05-19T13:53:23.504Z - info: Starting ehlo
2022-05-19T13:53:23.515Z - info: Listening on port [2525]
      throw er; // Unhandled 'error' event

Error: 140277961931648:error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca:s3_pkt.c:1500:SSL alert number 48
140277961931648:error:140940E5:SSL routines:ssl3_read_bytes:ssl handshake failure:s3_pkt.c:1217

There was a recent support topic about Certificate mismatches that may have some useful information in? Email Hostname Certificate Mismatch Causing sidekiq Queue Overload, Severe Site Instability - #8 by RGJ

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