Yes, thats pretty much the scenario. I was going to get exchange email relayed through our Mdaeomon server. (incoming email can be forwarded to the exchange server and outgoing relayed by MDaemon. I was going to put a new zone in the dns server for the sbs servers domain and add an mx record so that when Mdaemon forwards emails to exchange it can resolve the ip address of the exchange server privately (thus getting around not having to register the sbs domain). But my problem has always been (becasue i know very littelabout the way blackberry's work) how a device will talk to the bes server at my company. I wanted to find out how they communicate, how do they find eachother over the network, do they use ip addreses or is it a completely different network (i.e. ipx compared to tcp).