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Event ID: 4153 Source: MSExchangeIMC

<IP address> attempted to submit without using authentication. the submission was not allowed.
This event is just an error received when an email arrives on the IMC and is not compliant with the relay rules. Most likely authentication will be ok, but submitting the email is first tried without authentication. The Exchange logging should be set to high to see the success.
Several newsgroup posts suggest that installing Microsoft security patch MS03-046 is the cause of this problem. See ME829436 to see the security bulletin.

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