The following series of screen shots show you how to setup an email account in Netscape 6.
Firstly, choose 'Edit' then 'Mail/News Account Setting'

Now choose 'ISP or email provider' then click 'Next'
Enter 'Your Name' here and the 'Email Address' you are setting up, then click 'Next'
Enter your mail server details in the 'Incoming Server' field and your 'Outgoing (SMTP) Server' details on this page. Ensure to select POP as we do not support IMAP. Once you have done this click 'Next'
Enter you user name in the correct syntax, 'username%domain.com', then click 'Next'
You have now set up your mail account and are ready to download email, click 'Finish' to end the wizard.