Hi, I have installed ISA server on a machine and i have put 2 network cards on it. The first network card is the external one which has internet IP addresses and on the second one i have put an internal IP address. On the external card, i have put 2 internet ip addresses, one of them is the Exchange mail record. On another machine, i have installed Exchange 2003. What i want to know is how could i let the Exchange 2003 receive messages from outside since i could send messages to outside easily using ISA 2000?