Here are the general email settings for any client (Outlook, Thunderbird, Mac, iPad, etc.):
Username: firstname.lastname@example.org (MUST YOUR FULL EMAIL ADDRESS)
Password: your password
Incoming (IMAP) server:
Outgoing (SMTP) server:
Outgoing mail server requires authentication.
If you see pop-up windows related to verifying the identity or certificate, simply hit Continue. This is related to the name of the server being different than your website name. It is not a security issue, and can safely be ignored.