<p>i sent my app and everything else last week. however, i did not get a confirmation in email or regular mail. is this something to be worried about?</p>
<p>It takes them a bit of time to process everything, and I think that CMU doesn't send confirmation until they've had time to open everything of yours (transcript, app, teacher recs). They probably haven't processed all the paper that comes in the mail yet, especially since Christmas was yesterday and the postal service is a bit slow at this time in the year. Call in a week if you're worried.</p>