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Event ID: 2028 Source: MSExchangeIS

Source
Level
Description
The delivery of a message sent by public folder <folder id> has failed. To: <recipient> Cc: <recipient> The non-delivery report has been deleted.
Comments
 
As per Microsoft: "This error indicates that a non-delivery report (NDR) was destined to a public folder and the NDR is being thrown away. One of the following could cause this error:
- Sending on behalf of a public folder
- Sending copies of Delivery Status Notifications (DSNs) to a public folder
- Public folder replication problems". See MSEX2K3DB for more details.

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