Gah!
Upon recent developments, I’d like to change my whishy-washy stance to a more formal he’s-the-poopyhead position.
I hope he’s not being regionally specific, because shit like this travels fast.
OK, my sympathy fades… torch him!
Yup, put me in the “he’s crossed the line” camp now. He sends you an unsolicited, questionable email, then flames you for not appreciating it? Puh-leeeze.
Forward BOTH his emails (and your response to his first one) to a rep responsible for enforcing the privacy policy at the U.
It is really up to THEM to decide whether he violated their policy in the first place, though the fact that you didn’t know him is a key indicator of that. Another indicator is how many folks received his first email, which they may be able to determine.
You already cut him some slack by not complaining about the first email, which in my mind IS in violation of the policy. Don’t cut him any more.
Yep, he definitely crossed the jerk line. What a weiner.
And another vote for sending him a link to this thread. 
Dump him hard and fast. Report it all to your alum people. The first letter was in poor taste, but not unforgivable. The blustering of the second is just plain stupid.
Second that.
It also depends on your grad school. Certainly, if it was an MBA program, that kinda assumes that there is a professional network out there you can contact. Certainly I’ve presumed upon my MBA network many times to make a 2 minute sales pitch or float a resume. I also get unsolicited resumes or people researching something for a class probably twice a month. Sometimes I hit delete, sometimes I might even bother to read the entire email, sometimes I’ve even tried to be helpful.
I don’t think you’re being a jerk but you can always just hit delete.