I opened this question yesterday and really didn't get resolution, so i did some more testing and have this to offer. I have a 2k3 server that is currently the main exchange server. I just installed 2k7 on a fresh box and will be migrating over. Everything seemed to be set up per technet correctly. the admin groups and routing connectors are set up. I can send mail from the outside to a mailbox on 2k7 and i can recieve it. But i can't reply. So mail is not going out of the 2k7 box through 2k3 like it should. Where can i begin to look for issues? Do i have to create a send connector on 2k7?