Event ID - 178

Event Id178
DescriptionAn error occurred while transferring in message 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 unrecognized-OR-name diagnostic code were returned. [MTA SUBMIT 17 73] (14)
Event InformationAccording to Microsoft :
This event occurs if the Directory Synchronization object does not have a valid X.400 address.
To resolve the problem:
1. Using the Exchange Server Administrator program, select the Exchange Server container, double-click the Directory Synchronization object, and then click the E-mail Addresses tab.
2. Type a valid X.400 address.
Reference LinksEvent ID 178 During Directory Synchronization
Event ID 178 while Synchronizing Exchange and MS Mail?

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