I pulled almost all my hair out and still cannot figure out what I am doing wrong.
Here is the scoop:
I currently have an ISA 2004 firewall in place that is working fine taking all email for my .com domain.
We purchased a ASA 5510 and I am configuring it to become the new firewall and use its CSM capabilities. For configuration and testing, I modified my .net mx record to resolve to the ASA.
I configured my exchange server to receive .net email as well and added the smtp address to my mailbox. Email sent internally to the .net works fine.
The problem is outside email. Something is wrong on the ASA that is blocking email from reaching the exchange server. Testing via telnet does not respond. Testing via email validation using 3rd party network-tools website shows connected, but recipient cannot be verified.
I am attaching a diagram of my layout. Here is the configuration of my device:
Thanks in advance for your help.