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Event ID: 4120 Source: MSExchangeIMC

Source
Level
Description
In the process of creating a notification of delivery failure to the sender of a message, an error occurred causing the notification to be aborted. The sender will not be informed that his original message failed to be delivered.
Comments
 
A message in the Imcdata\In folder may never be delivered and may remain in that folder because it has more than 32, 766 (0x7FFE in hexadecimal numbers) recipients defined. Messaging Application Programming Interface (MAPI) uses the Emsmdb32.dll file to communicate with the information store, and the Emsmdb32.dll file has a limit of 32, 766 recipients defined for the number of recipients on a single message. See ME272672 for a hotfix applicable to Microsoft Exchange Server 5.5.

See ME254893 for additional information on this event.

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