troubleshooting Question

PIX NAT based on port issues

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Telstar-Networks asked on
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Okay, so here is the goal: is set as a public IP, let's say

Inside the network, I am using a Sonicwall appliance in front of an SME mail server.

What I want is for outside requests for on port 25 to use NAT to send the traffic to the Sonicwall for spam/av filtering.   When requests for come in on port 80 or 443, I want NAT to send those to the SME server for webmail.  

What I have done so far is gone into the ASDM and set up a Static Policy in NAT to map to the Sonicwall.  This works fine as long as I leave protocol on IP.  When I try to change the protocol to TCP port 25, the NAT stops working.  

I tried to leave the above rule using IP and then create a second one to NAT port 443 traffic on to the SME server and then simply place that rule higher in importance than the other Static Policy, but, again, whenever I change protocol from IP to TCP 443, the NAT stops working completely.

Any ideas?  As you can guess, I am not very well versed in PIX or using NAT in it.

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