This code indicates that a temporary routing error occurred or that a bad routing configuration exists. This issue may occur ...

{4}: This code indicates that a temporary routing error occurred or that a bad routing configuration exists. This issue may occur in one or both of the following scenarios: a) A Simple Mail Transfer Protocol (SMTP) connector is configured to use DNS without a smart host and is also configured to use a non-SMTP address space such as an X.400 address space, b) A message was sent to a recipient who was identified as a member of a routing group that was deleted. If the problem persists, use the WinRoute tool to examine the routing groups in the tree view pane, and then examine the address spaces of the route that the problem message takes.