Legacy SSL/TLS MailEnable

I am using MailEnable to serve email. For some reason, Em Client SMTP uses Force SSL/TLS and IMAP uses Legacy… What would cause Em Client not to be able to use Force SSL/TLS for IMAP.

eM Client are specific for IMAP & SMTP SSL connections.

IMAP
Port 993 = Use SSL/TLS on special port (legacy)
Port 143 = Use SSL/TLS if available

SMTP
Port 587 = Force usage of SSL/TLS
Port 465 = Use SSL/TLS on special port (legacy)