This might cost me my internship!

Suggestion: Quickly write up -- by hand, no typing -- a short note, humorous note explaining your gaff and reiterating how much you enjoyed your meeting. Any good manager knows that we all make mistakes, and a handwritten note is always appreciated by a person in a hiring position. I know in my previous career, I always remembered who sent the short, friendly thank-you in their own script. It's genuine. If you do that, I'm sure he or she will understand, and you won't jeopardize your internship.

i dont get why missing a signature would cause you a position

I agree with the previous poster: Even in this competitive arena, I doubt a small mistake like that would cost a good candidate an internship. But taking that extra step will help you sleep at night.

One suggestion: Send a handwritten note, not an e-mail. It shows you make the extra effort, and you'll stand apart from the other applicants. Every business etiquette book recommends a personal note instead of something typed or e-mailed.

I've interviewed dozens of job candidates over the years. It's the ones who really take the interview process seriously -- well-dressed, polite, a little early, a copy of resume in hand -- who always stands out. I know these things sound obvious, but they're not to many people. I had a student at an Ivy League school send me a generic cover letter with a fluorescent Post-It bearing my name. I sent it right back to her with another Post-It on it that said, "You've got to be kidding me." She stood out for all the wrong reasons.

Don't you think that was just as tacky as the Post It note? You should have taken the high road and just filed the resume. Plus, it's against HR laws. Hummm...

No, I don't think it was tacky at all. I wanted the student to get the point. She would never get a job by sending out cover letters like that.

Just curious: What HR law is violated by responding to a letter that comes in an envelope addressed to me?

If the letter is written to you and you are the representative for the company, then there are several laws that you violated. It was not professional at all.

If you were a mentor of the sorts and it was sent to you for evaluation, then that's one thing but it doesn't seem to be the case here. It was just poor taste. (If it was really done).

I'm sorry if it offends your taste. But what law(s) were violated? I would like to know what was illegal.