Deselect the checkbox next to Automatically set up account
Click Create
Fill in the following Incoming Mail Serverinformation:
Account Type: Select IMAP/POP
Incoming Mail Server:You can obtain this information from your webmail interface and then going to Settings > Forwarding and POP/IMAP settings. To access your Webmail interface, you can use the URL of the form http://webmail.yourdomainname.com
Username: Enter your full username (same as your email address)
Password: Enter your email password
Click Continue
Enter the following Outgoing Mail Serverinformation:
Outgoing Mail Server:You can obtain this information from your webmail interface at http://webmail.yourdomainname.com and then going to Settings > Forwarding and POP/IMAP settings
Select the box next to Use Authentication
Username: Enter your full username (same as your email address)
Password: Enter your email password
Click Continue
Verify your Account Summary and click Create
Thats it, your account has been setup! You may now send and receive all your emails using Apple Mail 3.0 (Leopard)