Event ID - 202

Event Id202
DescriptionUnable to transfer in message message id because an unsupported extension was detected. A non-delivery report has been generated with reason code error code and diagnostic code error code.
Event InformationAccording to Microsoft:
This event occurs when a message is received from another message transfer agent (MTA) and the message contains an extension to the X.400 standards that the Microsoft Exchange Server MTA does not recognize.
Reference LinksExchange (MSExchangeMTA)

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