Subscription is unable to send the email message to mailbox specified in the "To:" field of the "Action" screen of the Subscription Wizard.
Displayed on screen is "Failed to send message".
Shown in the Application Event logs on the MessageStats Server is:
The server rejected the sender address. The server response was: 530 5.7.1 Client was not authenticated
Testing SMTP communication (http://support.microsoft.com/kb/153119) via Telnet also fails with the same Exchange error code 530 5.7.1.
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