Create a New Mail Account:
1. On the Tools menu, click Accounts.
2. Select: Mail
3. Click New
4. Select account type: ( POP3 or IMAP)
5.Under the Account Settings tab:
Name: Your name
Email Address: full email address
Account ID : Must be the full email address ( firstname.lastname@example.org)
POP server: mail.yourdomain.com (replace yourdomain.com with your domain name)
Password: email password
SMTP server: mail.yourdomain.com ( replace yourdomain.com with your domain)
6. Click Ok to save the settings.
More info can be found Here
for additional features that Entourage has to offer.