you may want to email them back to let you know you received it. Who knows - it may be a final paper that did not get to where it was suppossed to go. NOT that that is your problem, per se... just a thought.
(Especially if it was well written....)

:)

And, if it was IU mail - you know how frickin screwy it is. Maybe the kid will just resend it to his professor. Anyway - I know that my IU email has been lifted, and at random intervals I get a message stating that so and so's mailbox is full and that my message has not been delivered. (When I never wrote to so and so.) UITS says it's nothing to worry about.... yeah, okay, whatever.