Unable to send a message/probe/report to recipient with MTS-ID because a routing loop was detected. Contact Microsoft Technical Support. [ ] (14)

Details
Product: Exchange
Event ID: 148
Source: MSExchangeMTA
Version: 6.5.6940.0
Component: Microsoft Exchange Message Transfer Agent
Message: Unable to send a message/probe/report to recipient <recipient> with MTS-ID <id> because a routing loop was detected. Contact Microsoft Technical Support. [<value> <value> <value> <value>] (14)
   
Explanation

This event indicates that a message destined for the named user was not sent because a routing loop was detected. The routing table contains all the information that the message transfer agent (MTA) needs to determine how to route messages.

   
User Action
  • Rebuild the Routing Table. To manually rebuild the routing table, open the Exchange Administrator program, navigate to Org\Site\Configuration\Servers\<servername>. Double-click the Message Transfer Agent object in the right pane. Then, click the Recalculate Routing button.
  • Open the Gwart0.mta file with a text editor such as MS Word. Look for possible reasons for looping messages such as redundant routes. If necessary, contact Microsoft Product Support Services for assistance.
  • In the General property pages of the MTA Site Configuration and Information Store Site Configuration objects, select the check box entitled Enable message tracking. This will enable the tracking of messages and can help troubleshoot message delivery issues.

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