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Event ID: 4192 Source: MSExchangeIMC

Source
Level
Description
Delivery of a message was aborted because it appeared to be an impersonation attempt or unwanted bulk mail. The 821 originator was joes@spam.net. Either this address or the 822 message triggered this based on TurfTable entries  in the registry. The message that caused this was PBF3S5YB. This message will not be delivered. It will be copied to \turfdir.
Comments
 
The reason for this behavior is that by default the turf directory is set to \Turfdir in the registry. This directory is not created by the Microsoft Exchange Server setup process. See ME193926 for more details and workaround.

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