Incoming & Outgoing 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. Here, you would need to login with your email address and the corresponding password
Logon Information
User Name: Enter your full username (same as your email address)
Password: Enter your email password
Next, click on More Settings and select the Outgoing Server tab. Here you need to select the My outgoing server (SMTP) requires authentication checkbox, and click OK.
Click Finish to close the E-mail Accounts dialog box.
That's it, your account has been setup! Just click the Send/Receive button and all your emails will be downloaded by Outlook 2003.