I did some tweaking on the config used nmap to test the ports. Result now shows that port 25 is open but I still get FILTERED from portqry on the mail server.
Result of nmap on the pix interface:-
PORT STATE SERVICE VERSION
23/tcp open telnet Cisco telnetd (IOS 6.X)
25/tcp open tcpwrapped
80/tcp open tcpwrapped
81/tcp open tcpwrapped
110/tcp open tcpwrapped
Result of nmap on the router interface:-
PORT STATE SERVICE VERSION
23/tcp open telnet Cisco IOS telnetd
25/tcp open tcpwrapped
80/tcp open http Cisco IOS administrative httpd
81/tcp open tcpwrapped
110/tcp open tcpwrapped
Command used: nmap -sT -sV -p 1-120 -v -PN x.x.x.x
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What does tcpwrapped mean?