Outlook 2000 / Express
  Windows Hosting Panel | Linux Hosting Panel | WorldClient (Webmail)  
Click on the Tools menu and select the Accounts... option.

 

Click on the Mail tab, select your MainTree account, and click Properties.

 

On the Properties screen, click the Servers tab and select the check box for My server requires authentication.  Click ok, then ok again and you are done.

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