|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)|
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.
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.