|Component:||Microsoft Exchange Transport|
|Message:||Categorizer is NDRing a recipient with address <%1>:<%2> with reason code <%3> (<%4>).|
This error event occurs because all public folder replication that uses Simple Mail Transfer Protocol (SMTP) must originate from an authenticated source or from a server that has been granted Send As permissions.
A common symptom of this error is the generation of a specific non-delivery report (NDR) message. Specifically, you may receive the following NDR message when you try to replicate public folders from a domain that has a Microsoft Exchange Server 5.5 computer or a Microsoft Exchange 2000 Server computer to a domain that has a Microsoft Exchange Server 2003 computer:
MSExchangeTransport Event 9013 may also be logged in the Application log. If it is also logged, there is a specific user action required to resolve the error. To view both these events, set diagnostic logging on the Categorizer category of the MSExchangeTransport service to Maximum.
To resolve this public folder replication issue:
Before you edit the registry, and for information about how to edit the registry, see Microsoft Knowledge Base article 256986, “Description of the Microsoft Windows Registry” (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).
For additional information about troubleshooting public folder replication problems, see the following Microsoft Knowledge Base articles: