Question about post interview thank you

I had a panel interview yesterday for a new grad position and I had planned on sending thank you letters in the mail today to all interviewers. However, at the end of the interview they said I should hear something by tomorrow so I a really can't mail it out. I was either going to drop them off in person or email them. I'm not sure how I would drop them off because I don't really know where all of their offices are etc. I guess my main questions is an email considered OK now? I have never sent thank yous for jobs by email.

Any suggestions?

Thanks
Quote from DanoobI had a panel interview yesterday for a new grad position and I had planned on sending thank you letters in the mail today to all interviewers. However, at the end of the interview they said I should hear something by tomorrow so I a really can't mail it out. I was either going to drop them off in person or email them. I'm not sure how I would drop them off because I don't really know where all of their offices are etc. I guess my main questions is an email considered OK now? I have never sent thank yous for jobs by email. Any suggestions?Thanks