I know email’s not entirely your jam, and yet. We’ve got a situation with a family member using email through my domain who can only receive mail when logging in insecurely. (Not using SSL and explicitly checking the box that says “Allow insecure connection”.)
Client is Apple Mail, and I’ve tried walking through the client config steps at https://triptronix.net:2096/cpsess2140317596/webmail/paper_lantern/mail/clientconf.html with no success. Used to work 10 days ago, though!
I know you can’t debug our email client per se, so my question is more what can you tell me about what I can do to see where in the software/network chain the problem lies? The error we’re seeing is (IIRC) that the mailserver’s not responding to attempts on either 993/SSL or 143 without authenticating insecurely. I won’t have access to the machine again until late Sunday at the earliest.