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I have two sites connected with one site having vpn firewall.
I to want route all mail traffic on other site mail server through vpn
connection. But this doesnot happen till i disable my local area
connection.

network 1 : 172.16.2.0
network 2: 172.16.1.0

i want to divert 172.16.1.x mail traffic to 172.16.2.x through vpn
connection, while user's on 172.16.1.xx network should still be able to
acess 172.16.1.x mail server.