An error occurred while transferring message because the content type could not be downgraded. An X.400 API Association (XAPIA) reason code and diagnostic code were returned. [ ] (14)

Details
Product: Exchange
Event ID: 173
Source: MSExchangeMTA
Version: 6.5.6940.0
Component: Microsoft Exchange Message Transfer Agent
Message: An error occurred while transferring message <message id> because the content type could not be downgraded. An X.400 API Association (XAPIA) <error code> reason code and <error code> diagnostic code were returned. [<value> <value> <value> <value>] (14)
   
Explanation

The message transfer agent (MTA) has determined that this probe object has a 1988-specific content type, and therefore it cannot be sent over a 1984 X.400 backbone. This message was not originated by a Microsoft Exchange Server client because Microsoft Exchange Server does not send probes.

   
User Action

Use message tracking to identify the message sender, and ask the sender to resend the probe with a 1984-conformant content type. Or, if the backbone supports the later X.400 version, use 1988 X.400 protocols.

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