I have a client who would like to do something strange and I am not sure how to accomplish it.
They have 3 Exchange 2003 servers. We will call them A, B, and C. They are all in the same Active Directory and same Exchange Organization. Three seperate mail storage groups and three seperate stores. They want to setup the following:
Users on Server A can email Users in Server C and vice versa. No send/recieve to the external world. And no send/recieve to users on Server B.
Users on Server B can email Users in Server C and vice versa. Send/recieve to the external world is allowed. No send/recieve to Users on Server A.
Users on Server C can email users on Server B and C and vice versa. Send/received to external world is allowed.
I don't even know if this is possible. Any ideas? I can think of some stuff, but they all have the same domain name, IE @mydomain.com. So my ideas are failing.