Can you block someone from emailing you constantly? Please help!?

[aegirl318]

So there's this freaking weird a** guy from my high school who got a hold of my email, probably from facebook (which blows because I can't remove my email from there, no matter what I do) and he keeps emailing me. I'm getting annoyed/freaked out and I keep marking all of his stuff as spam but it keeps ending up in my inbox. He's friend requested me twice before on facebook. I denied it the first time, then blocked him the second time. And now he's following me on twitter, so is there any way of blocking him from that too? Please help. This guy is a total creep and I'm about to loose my mind and probably hire someone to kill him, ughh.