Our Exchange environment consists of Exchange 2003 and Exchange 2007; we are in the transition phase. Users with mailboxes on Exchange 2003 can send and receive internal and external email, including mail from users with mailboxes on Exchange 2007. Users on 2007 can send to and receive from users on 2003. The users on Exchange 2007 can also receive external mail but they cannot send external mail. Messages that are sitting in the queue have an error of: A matching connector cannot be found to route the external recipient.
Currently there are no send connectors set on the Exchange 2007 server and Im hoping that someone could explain how to configure the Send Connector to route external mail so that it goes through the Exchange 2003 server? Perhaps this isnt necessary?
Im fairly new to Exchange so any assistance would be much appreciated.