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Event ID: 3028 Source: MSExchangeTransport

Level
Description
A non-delivery report with a status code of <status code> was generated for recipient <mailbox> (Message-ID <message id>). Cause: The e-mail account does not exist at the organization where the message was sent. Either the recipient address is incorrectly formatted or the categorizer was not able to properly resolve the recipient.Solution: Checking the recipient address and the recipient policy and re-sending the message are among the first steps in resolving this error.
Comments
 
This event is self-explanatory.
See MSEX2K3DB for information about this event.

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