Question about securing POP connection

Currently I have clients cpanel and webmail URL's forward to my servers domain. Example: clientsdomain.com/cpanel forwards to myserver.domain.com/cpanel and I have a SSL setup for security.

I set this up WHM > Service Configuration > Manage SSL Certificates.

So WHM/Cpanel/ and Webmail are all secured what about POP3 and IMAP? I have customers that use Pop3 and IMAP with outlook. I would like to offer some sort of security for them, but if I enable this certificate to be used with POP3 and IMAP in this Manage SSL Certificates page, how will this work for them?

Would they have to change their mail server settings to mail.myserver.mydomain.com then under advanced settings enable the SSL? Would this work? Or how do I do that?

 

Thank you David for the advice, I will try it out on a test email account before I start advertising this to clients.