1.) Buy a burner laptop on the street, in cash, then wait a while.
2.) From an open wireless connection, where you're far enough away to not be on any security cameras, use Tor, then VPN tunnel through a high traffic public server in China or Russia. You want to make sure you're not driving out of your way to be at a place at a time, in case the IP gets traced back for whatever reason.
3.) Prepare an elaborate email. Make it good.
3.) Setup an online meeting with someone. Play a video game online, start a skype chat, or otherwise create an alibi for how you couldn't be writing emails.
4.) Send the email through an anonymous email service.
5.) Destroy the laptop as far from campus as possible.
Did I miss anything?
In the end "Chinese hackers" get blamed for the email, and the media attention fizzles.