ISA Server as mail relay

Hi, I have a Netscreen firewall in front of an ISA Server. The link
between the netscreen and isa is a 192.168.x.y. My exchange server is
behind the isa server on address 192.168.y.x. The netscreen is set to
forward all smtp traffic to the exchange server. This setup worked on NT4
and Proxy V2. However with W2K and ISA the mail server cannot send or
receive any mail. I have run the wizard to create the exchange/mail
protocol rule but it still does not work. Any pointers would be
appreciated

Thanks

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