550 error: Relay Access Denied

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This error has to do with authentication most of the time. The mail server is requiring information that you are not supplying. If it is a FirstLink e-mail account, make sure your username and password information is correct and that outgoing server authentication has been turned on.

Retrieved from "http://support.firstlink.com/index.php/550_error:_Relay_Access_Denied"
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