How the hell did the poster "customize" his address to ...ummm...fit the post???
not hard at all...by telnetting in to port 25 of a system on the net, you can talk directly to that systems sendmail...mail is passed in ascii format...few systems require a HELO (identifying the system telnetting in)...then you simply type in the mail headers manually...combine this with the fact that some systems let you post to usenet by email, and you can do just about anything and be untraceable (i think, anyone know for sure?)...
Well you can do it this way by using a mail to news gateway, as for tracibility, this is quite tracible. Remember all you have to do is have a log of all incoming telnet sessions and a log at the home machine of all out going telnet sessions and you're easily paired up with it. That's one of the ways, some stupid fool got caught mailing a death threat to the president using forged mail from 'never.gonna.catch.me.org' Ben.