<p>Hi,
I'm wondering whether the dealine for MIt caltech and princeton is postmarked by Jan 1 or received by then?
Thanks</p>
<p>Postmarked.</p>
<p>There is no mail service on January 1, so it can't be a received date. However, when you have any specific question like this, you would be wise to consult the specific college's website instead of a general site like this one.</p>
<p>Thanks, anyway</p>