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Event ID: 178 Source: MSExchangeMTA

Source
Level
Description
An error occurred while transferring in message C=US;A= ;P=ACM;L=EXCHANGE-010786143214Z-30 because the directory name could not be expanded to an O/R address. An X.400 API Association (XAPIA) unable-to-transfer reason code and unrecognised-OR-name diagnostic code were returned. [MTA SUBMIT 15 73] (14)
Comments
 
According to Microsoft the directory synchronization object must have a valid X.400 proxy address. See MSEX2KDB for additional information about this event.

Also see "JSI Tip 1869" for more information on this event.
As per Microsoft: "The problem can be corrected by adding a valid X.400 address to the sender's mailbox properties on the Email Addresses tab in the Microsoft Exchange Administrator program". See ME155104, ME149583, and ME158039 for more details.
This event has been reported when one is not able to send outbound Internet email from an Exchange 5.5 account. You will receive this if you deleted the X.400 address from an Exchange Server 5.5 account. This can be fixed by adding the X.400 email address back to that account.

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