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Event ID: 51 Source: MSExchangeMTA

Source
Level
Description
<Exchange server name> An unknown MTA has attempted to bind. The MTA name in bind is <other MTA host>. The MTA presentation address is <address> Association Index: 2354. [MTA XFER-IN 23 42] (14)
Comments
 
See ME152932 and ME166308 to fix this problem.
This event means that a remote message transfer agent (MTA) has attempted to establish a messaging session and there has been a mismatch in the specified security information. This could be a typo or other mistake; however, this should be investigated immediateley because it could indicate a security breach.

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