| Event Id | 202 |
| Source | MSExchangeMTA |
| Description | Unable 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 Information | According 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 Links | Exchange (MSExchangeMTA) |
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