Question about MS Exchange and Smoothwall Express

Hi,

I have a need to set up Exchange 2003 on a private lan with users who need
access to the Exchange server from both from the private lan and the
internet. I have port forwarding set up so that a user can access the
Exchange server fine from the internet using the public address of the
Smoothwall. Similarly, users on the private lan get their Exchange fix using
the private address of the exchange server.

The problem comes in with laptop users. If they set up their Exchange
account to use the private lan address, when out of the office nothing
works. If they set up the Exchange account to use the public address of the
Smoothwall, being out of the office works, but when inside, the Smoothwall
is discarding all packets (Martians?).

The old setup used a Symantec  Firewall VPN 200r and it worked in this
configuration. 

 Setting up an Orange segment is not feasible as the client only has one box
to run server and exchange.

Any help would be appreciated.

Richard
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