You must replace your normal mail.domain.com with the secure server name.
Please read the Outlook related article, first. Then come back to this article and adjust your settings.
Shared Web Hosting: Look in cPanel's left hand menu to find the name of your server. If you have gator123 then your secure server name is secure123.hostgator.com
Reseller: Unfortunately, you cannot convert your normal websitewelcome.com server name to a secure name. Please contact HostGator by phone or live chat to get the secure server name.
Secure POP3 is port 995.
Secure IMAP is port 993.
The outgoing mail is always SMTP, whether using IMAP or POP.
Secure SMTP is port 465.
Problems? Be sure that your computer's firewall is not blocking these ports. It is not always necessary to use your Internet Service Provider's settings, but if you cannot send from port 26 or 465, then we suggest you contact your ISP and ask for their outgoing mail server name.