This doesn't have to be done on Exchange Server at all.
If they don't use NAT, then all you need to do is route their MX servers
on your Router/Firewall/VPN end point to route the traffic through the
tunnel.
If they do use NAT, they you probably have to set up host files on your
exchnage serve
On the IMS you can specify routing by domain... For the domain(s) in
question you would specify an IP address which the VPN link would know
how to route to the appropriate endpoint. We did this several times with
customers when I worked for $vbc.
-Original Message-
From: MSX dude [mailto:
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