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mail server on additional address???

have 1 T1 connection with 2 public ip addr 
External(WAN)Address is the public ip of ASG box
External(WAN)[mail]Address is the additional address on public nic

mail server #1 local lan 10.10.75.2
setup dnat rule [any -> smtp -> External(WAN)Address
setup packet filters [any -> smtp -> mail server #1]
setup packet filters [mail server #1 -> smtp -> any]

This works fine

Then I setup our 2nd mail server...

mail server #2 local lan 10.10.75.22
setup dnat rule [any -> smtp -> External(WAN)[mail](Address)
setup packet filters [any -> smtp -> mail server #2]
setup packet filters [mail server #2 -> smtp -> any]

mail comes in to mail server #2 via External(WAN)[mail](Address) just fine
outgoing mail goes out the External(WAN)Address instead of External(WAN)[mail](Address) and gets rejected by other mail servers because of wrong reverse dns

I know I'm probably missing something simple here - at least I hope I am...


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