I have a catch-22 and I have not seen an answer in my research. I have a 2003 Exchange Server and just added a 2007 server w/ hub transport. There is 1 RGC setup between the 2003 and 2007 server so I should not need to add a link-state suppression registry entry. The email is working between the 2 servers and I can receive external email (from the Internet) on the exchange 2007 server. When I added a send connector on the 2007 server I was able to get email to the internet but I then started having looping errors. As soon as the send connector was removed the looping error stopped. On the send connector I chose to use a smart host and pointed it to my 2003 server (which is going to remian the primary server). So I am trying to determine what I need to modify on the Exchange 2007 or 2003 server so that all smtp traffic will go out only through the 2003 exchange server. Thank you.