| Event Id | 172 |
| Source | MSExchangeMTA |
| Description | An error occurred while transferring message <message id> out of the system because a function critical to the transfer is not supported. The message was not delivered with reason code <error code> and diagnostic code <error code>. [<value> <value> <value> <value>] (14) |
| Event Information | The message transfer agent (MTA) determined that this message has 1988 X.400 extensions marked as critical (required), and therefore the message cannot be sent over a 1984 X.400 backbone. This message was not originated by a Microsoft Exchange Server client |
| Reference Links |
Catch threats immediately
We work side-by-side with you to rapidly detect cyberthreats
and thwart attacks before they cause damage.