By Far the best E Mail Notifier is EPrompter. It does POP#,Hotmail,Yahoo, etc. The only one I found that does. Can customize each program. You can preview the mail so if there is an exe you can read the mail and don't have to worry about opening it. You can delete it from server on EPrompter. Great way to play it safe with Outlook.
Check it out and for free:
http://www.eprompter.com/