This error is a routing error specific to Microsoft Exchange Servers. Unfortunately, not much information is available on the possible causes of this error. Still, the Microsoft community has identified that a leading cause for this error is when a message is sent to a member part of a routing group that does not exist.
There is no proper way to fix this, instead involves a series of trial and error. Microsoft recommends using their tool - WinRoute, to diagnose and resolve the error.
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