Well, I think I just goofed up my migration from Exchange 2007 to 2010. Have been running for several weeks in a coexistence mode and everything has been fine. Decided to remove the old Exchange 2007 server, but did not remove the old send connector in 2010. I can't delete it now as it cannot find the original server. Local email is fine and we are receiving emails, but the are messages in the queue saying "A matching connector cannot be found to route the external recipient". Help!