I just put a new Exchange 2003 Server in my previously all Exchange 2000 organization. I set it up to be a front-end SMTP and HTTP server for several back-end servers. For some reason though, anything sent from this new server to ANY other server in the organization just hangs in the SMTP queue. The queue information just tells me that "The semaphore timeout period has expired.". I verified that DNS is working fine and that I can ping and browse to all of these other Exchange servers. There is nothing in the event logs that would indicate any problems. Thoughts?