What are my POP3, IMAP, SMTP Settings?
What are my POP3, IMAP and SMTP Settings?

Your User Name is user@yourdomain.com
Your Password is the same as your master password unless you have changed it.
Your Incoming Mail Server is mail.yourdomain.com
Your Outgoing SMTP Server is mail.yourdomain.com
Leave 'Log on using Secure Password Authentication (SPA)'
Un-Checked.
If you are using an email client, you must use SMTP Authentication.

In case your ISP blocks port 25 for SMTP access, you can also try using port 587 as an alternate for SMTP access.