Post-Interview Etiquette?

I was wondering what people thought was proper post-college interview etiquette. In the past, for on-campus interviews I have sent an email the evening of the interview (about 5-6 hours after) and sent a handwritten thank you note as well. For alumni interviewers I’ve only sent a thank you email.

Is it overkill to send both a handwritten note and an email? Would the interviewer think it was weird?

Email and note are overkill, IMHO.