SSL/TLS email setting not working but Non-SSL setting works

Hi,

I'm on a VPS with godaddy. I'm in the cPanel of the domain (myultratrust.com). I have set up the emails and the incoming mail and the outgoing mail server settings work fine for the Non-SSL settings but not the SSL/TLS settings.

this works:

Non-SSL Settings
(NOT Recommended)
Username: 	myusername@myultratrust.com
Password: 	Use the email account’s password.
Incoming Server: 	mail.myultratrust.com

    IMAP Port: 143
    POP3 Port: 110

Outgoing Server: 	mail.myultratrust.com

    SMTP Port: 25

Authentication is required for IMAP, POP3, and SMTP.

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this doesn't:

Secure SSL/TLS Settings
(Recommended)
Username: 	myusername@myultratrust.com
Password: 	Use the email account’s password.
Incoming Server: 	ip-184-168-116-73.ip.secureserver.net

    IMAP Port: 993
    POP3 Port: 995

Outgoing Server: 	ip-184-168-116-73.ip.secureserver.net

    SMTP Port: 465

Authentication is required for IMAP, POP3, and SMTP.

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Do I need to install a SSL certificate like it states here:
http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/InstallCert

If so, can I use openSSL? I've created openSSL certs before. But then how do I configure it for the incoming and outgoing mail servers using those assigned ports? Or is there some additional setting I need to look at in WHM?

Not sure how to go about securing the incoming and outgoing mail servers for the domain.

Thank you!