Try this
telnet 64.253.207.29 25
helo localhost
then follow the stuff in that link I posted. It should deny you to send an email. The only one that has worked for me is the one from my isp which I use for email. Just fool around with it. Telnet to all the open ports and see what happens, you learn by experience.

edit
oops, im an idiot, I had this telnet 64.253.207.29 localhost
it was a really bad typo, I changed it so now it's
telnet 64.253.207.29 25
That should work for you.