If they can view email headers (which is entirely possible) they could look at the header and possibly see the originating IP Address (the one your computer uses) and compare to emails you sent from your account. Personally unless they are overly curious if it was from someone they know, I doubt they would go and do that. Just don't send it from work...more likely they will be able to figure out it's from you.
My 2 cents at least.