Firewall/NAT

Hi I have a simple Monowall setup, I have Lan side which I have the companies Domain/Exchange Server and then I have a public webserver on the DMZ

my problem is I cannot get email that is sent from the public server to be received by the Exchange server

I know that the DNS is all correct as all mail that is for exchange server is delivered if mail is sent from outside network

I run Monowall with a public IP Subnet on DMZ

Here are my current firewall rules

Lan

* - Lan Net * - * - *

WAN

Rules for NAT Port Forwarding
* - * - DMZ Net  - *

DMZ

TCP - DMZ Net - * - 172.0.0.2 - 25

* - DMZ Net - * - !LAN Net - *

If you need more info please ask

Thanks

Is your public webserver trying to send email to the public DNS name of your exchange server?  If so, this will not work.  You'll need to configure your webserver to use a local DNS name or IP address.

This is due to NAT limitations in m0n0wall.  See the following documentation: http://doc.m0n0.ch/handbook/faq-lannat.html