cisco pix 501 port forwarding please assist me to setup

[wanttolearn2010]

Hello

I need to configure my pix501 to allow connections from the net (port 25) to my exchange server.

so from what i understand i need an access rule on the outside interface to somehow NAT to inside interface & exhcnage host.

how i have my network configured, is as below:
ADSL modem with static IP - & internal IP is 192.168.1.254
which connects to outside interface of my pix (192.168.1.64)

my inside network is on the 192.168.10.0/24 subnet

i need to allow traffic from my adsl through the outside interface of pix and forwared to my exhcange server 192.168.10.23.

My dns is setup and running corectly as i have checked using the

https://www.testexchangeconnectivity.com/

is it says dns is fine however port 25 is closed.

from my internal network i can email out to any domain fine.

on my internal network i can telnet fine to exchange sever.

Any assistance would be appreciated. thanks

 

[Supergrrover]

here is the cisco guide -

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a00804708b4.shtml

If you are using 6.x code, you will need
"no fixup protocol smtp 25"
Exchange uses ESMTP and the inspection will kill it.

Hope this helps

Brent
Systems Engineer / Consultant
CCNP, CCSP