When you get an error message as the one stated below, you may need to check if SMTP Authentication is enabled in your Outlook Express.
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"The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'example@domain.com'. Subject 'Read: Test Subject', Account: 'mail.yourdomain.com', Server: 'mail.yourdomain.com', Protocol: SMTP, Server Response: '503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.', Port: 25, Secure(SSL): No, Server Error: 503, Error Number: 0x800CCC79"?
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You may refer to flash tutorial below on how to enable SMTP Authentication on your e-mail account.
