I have a PIX 515E. I have an old smart host server that I am retiring with an ip address of 172.17.2.50. I have built a new smart host server with an ip of 172.17.5.2.
My current working config on the pix is the following:
access-list 30 permit tcp any host 188.8.131.52 eq smtp
static (inside,outside) tcp 184.108.40.206 smtp 172.17.2.50 smtp netmask 255.255.255.255 0 0
nat (inside) 2 172.17.2.50 255.255.255.255 0 0
When I tried testing the new server, I just replaced the ip address of 172.17.2.50 with 172.17.5.3. Our mail flowed for about 10 email messages but then stopped.
Am I missing something?