IMPORTANT - WE RECOMMEND YOU USE SMTP AUTHENTICATION - PLEASE READ THIS BEFORE SETTING UP YOUR EMAIL
Eudora | Outlook Express | Other Email
Go to the Tools | Options menu item, click on Sending Mail, and make sure that the "Allow Authentication" box is checked (you should see something similar to this):
Go to the Tools | Accounts menu item, click the Mail tab, highlight the mail account name and click Properties, click the Server tab and make sure that the "My Server Requires Authentication" box is checked (you should see something similar to this):
Search your software's help system for terms such as "SMTP", "authentication", "server authentication", etc. If you cannot determine how to set your email for SMTP authentication, then you might wish to consult the software maker's Web site or contact its tech support.