Go to 'Tools' -> 'Accounts…' -> 'Add…'
Display Name: (as you wish)
//Next ->
Email Address: (xxxx@domain.com)
//Next ->
My incoming mail server is a [POP3] Server.
Incoming Mail (POP3, IMAP, HTTP) server: [mail.yourdomain.com]
Outgoing Mail (SMTP) server: [mail.yourdomain.com or your ISP SMTP server settings]
Account Name: xxxx@domain.com (same as email address)
Password: as appropriate
Log in Using Secure Password Authentication is NOT checked.
Click 'Next' and 'Finished'