Event ID - 2006

Event Id2006
SourceMSExchangeIS Private
DescriptionThe generation of a delivery report or a non-delivery report has failed due to error 0xfffff9bf.
Event InformationAccording to Microsoft:
Delivery receipts (DRs) are not being properly routed to the message transfer agent (MTA) for delivery when delegates and recipients exist on different servers. See the "More Information" section for exact steps to reproduce this issue.
To resolve this problem, obtain the latest service pack for Exchange Server 5.5.Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4.
Reference LinksXADM: Delivery Receipts Not Properly Routed to MTA for Delivery, Causing 2006 Events

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