I have a client who is having difficulty with a new Exchange 2007 Server. He is attempting to relay messages from a UNIX box to Exchange Users. Anything over 4 MB gets stuck in the queue. We've already applied the following change:
Set-TransportConfig -MaxReceiveSize 10MB
Didn't seem to help. Is there somewhere else in Exchange that needs to be updated? In addition, what's the proper way to configure Exchange to allow internal hosts to relay mail through Exchange both to Exchange users and Internet users?