SMTP traffic getting through router and firewall

I am able to telnet to my SMTP server from my router and I can see a permit match on the ACL of my outer interface of my router when someone from outside telnet's in, but their connection doesn't work.

ROUTER --------- FIREWALL --------SMTP Server

Is there a way to see if the packet is making it through the router and to the ASA? I tried debug smtp but nothing came up even when the connection was successful from the router. There are no ACLs outbound on my inside interface of the router.

Internet ---------Router -------------Firewall --------SMTP Server Works from here------------------->

Works to here----| ACL match permits into outside interface.

Thanks.