I am having trouble getting SMTP traffic to pass thru my ASA and into the Linux machine hosting my E-Mail. When I try to telnet in on port 25 it just times out. I am routing multiple other protocols into other machines without a problem, but for some reason SMTP does not make it.
To make things even more confusing, I put a firewall rule at the top of my list that said to log and allow ANY traffic comming to this ip. And when I FTP in and such I can see the logged traffic. When I send in SMTP traffic I get nothing, no logs or anything.
The only thing I can think of is that possible the CSC module has a traffic inspection rule in place and is grabbing the traffic before it gets handed down to be processed by the built in rules. Anyone have an idea on this?