Port 993 seems fine, however Port 465 refuses to connect via my server.

The Port is open, on my mail server, SSL appears correctly configured. Interesting that Mailbird Pro says Port 465 works but only if 993 is closed. The idea is to have encryption both ways!!
Downloaded latest emClient version.
A records checked as well, any ideas?

Starting Nmap 5.51 ( http://nmap.org ) at 2017-07-12 04:49 EDT
Nmap scan report for (
Host is up (0.00043s latency).
465/tcp open smtps