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Event ID: 21093 Source: WTMsgqueuename

Received a report with an unrecognized report class [(looping non-delivery) - dropped ]
Worldtalk (or Netjunction as is now called) is a UNIX mail gateway that is used in the place of the Internet Mail Server to handle large volumes of internet mail. From time to time a message with lose its route and take the same path to get where it is going over and over again when this happens an Error 21093 is used to report a looping Non-Delivery Report. This message is common if you have really large volumes of mail (127, 000 users or more) in your Exchange Organization.

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