Don't know if this says something to someone; but I did this
home:~ # telnet localhost 25
and this is what I got:
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 home.myname.com ESMTP Postfix
However, when I do telnet 192.168.1.2 25 it does not connect.
Hope that helps.