we have a whole system in place for analyzing the email headers and determining that you are who you say you are. Arrington challenged people to spoof his site and it worked well. He still uses our site today: http://techcrunch.posterous.com/
That's cool. What if I take an e-mail from Mike Arrington's iPhone and just change the contents (well, I would also change stuff like headers with date/time)? I can't try it with Arrington because I have never received email from him, but I would have received email from my Facebook buddies I wanted to prank. winkwink
We're not giving this back: http://is.gd/75Vl