you must make your sure
1- first your server imap ports setting uccx Mail Server Configuration
Incoming (Secure IMAP) port =993
do not use the default 143 has uccx is not supporting that
you smtp Outgoing (Secure SMTP) : 587 if its configure on your mail server .or use the default 25 .
2- lastly you server mail imap and smtp
dont configure the dot like imap.server.
its has to be just servername.domain
but make sure you mail server has the same port configure for imap it has to be 993
thank yoy