With Microsoft Entourage open, click on the "Tools" menu, then click on "Accounts":

Click on the "Mail" tab, then click the "New" button:

Enter the name you want displayed when you send email. Click ">".

Make sure that "I already have an e-mail address that I'd like to use." is selected. Enter the POP email name you created for your WebMail account. Click ">".

Make sure that "POP3" is selected. Enter mail.yourdomain.com as both the Incoming and Outgoing mail servers. Click ">".

Enter the POP email address in the "Account ID:" box. Enter the password for this POP account in the "Password:" box and make sure "Save password in my Mac OS keychain" is checked if you want Entourage to remember your password for you. Click ">".

Enter an name for the account you just created, then click "Finish".

Click on the account you just created in the list, then click "Edit"

Click on the "Click here for advanced sending options" button.

A menu will pop up. Check the "SMTP server requires authentication" checkbox. Click the small square in the top left corner of the pop up menu to close it.

Click "OK".

If you will be using your WebMail POP account as your primary email account, click "Make Default". The new account should be displayed in bold type. Close the list and you're done! You can now send and receive email using your new POP email account.