The machine officenet is listening on port 25 via qmail running on the same machine (the officnet machine)... I am able to accept connections through port 25 (i.e. telnet into it) and send mail, but maybe there is a security setting with qmail that i haven't noticed with other applications. Now that I know that it only depends on port 25 relaying mail for me I am sure I can figure it out... thanks everybody.