I'm testing inbound connections using a port listener software.
all ports are working, only port 25 fail
this is what I use to route inbound connections:
access-list outside_access_in extended permit tcp any host 63.x.y.26 eq 951
access-list outside_access_in extended permit tcp any host 63.x.y.27 eq 952
static (inside,outside) tcp 63.x.y.26 951 192.168.200.2 951 netmask 255.255.255.255
static (inside,outside) tcp 63.x.y.27 952 192.168.200.2 952 netmask 255.255.255.255
using the exact command with port 25 replacing port 951\952 fail.
is there a different way of testing SMTP inbound traffic (test environment - no SMTP server)?
which log records will show me what exactly happen to those incoming packets that never show on the port listener?