I'm investigating an issue where emails sent by a certain domain (a school district) aren't being received.
In reviewing the logs I've found:
STARTTLS=server, error: accept failed=0, reason=sslv3 alert certificate unknown, SSL_error=1, errno=0, retry=-1, relay=server.domain.org [xxx.xx.xxx]
I suspect the issue is with the certificate or configuration of the sending server, but I'm hitting a dead end in researching it further to confirm.
Anybody have any insight?