I'm sure I'm being an idiot somehow, because everything hard is already working, but I can't seem to find the issue.
Ubuntu server 16.04/MySQL/PostFix/Dovecot
PostFix and Dovecot are working, and I can create, read, and send mail with Thunderbird with SSL on. Roundcube installer is finished and reports "OK", but I get errors trying to test the connections ((Login failed for bferrell from 192.168.100.31. Could not connect to ssl://mail.bdfserver.com:993: Unknown reason)).
Thunderbird settings
RC status
Brett