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Event ID: 3019 Source: MSExchangeTransport

Level
Description
A non-delivery report with a status code of 5.4.4 was generated for recipient <user>@<domain> (Message-ID <ID>).
Cause: Exchange cannot determine a route for this message or no next hop can be determined. A routing group topology does not have a routing group connector set up between the routing groups. Mail destined to a routing group that does not have a routing group connector to connect it to other groups cannot be sent.    
Solution: Add or configure your RGC between RGs.
Comments
 
Numeric Code: 5.4.4 is due to "No route to message next hop not found". For more information see ME284204.

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