503 This server needs authentication

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From: adrian (anonymous_at_discussions.microsoft.com)
Date: 03/28/04 

Date: Sun, 28 Mar 2004 06:56:53 -0800

The message could not be sent because one of the
recipients was rejected by the server. The rejected e-
mail address was 'xxxxxxx@hotmail.com'. Subject 'message
from express', Account: 'mail.pontesquash.com',
Server: 'mail.pontesquash.com', Protocol: SMTP, Server
Response: '503 This mail server requires authentication.
Please check your mail client settings.', Port: 25, Secure
(SSL): No, Server Error: 503, Error Number: 0x800CCC79

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