I have one ISA box with one public interface (public IP address). I'm thinking of adding an Exchange 2k server to my win2k domain,(say, Exchange serverB). This Exchange server will have different users with different email addresses. Example, Exchange ServerA users have email addresses with @acme.com. On the new Exchange server (serverB)will have different email addresses, @company.com. Can anyone guide in the right direction as to how to set this up? I hope this make sense! Thanks!