<p>I think it depends on the college and of course the admissions counselor. I have the emails of two counselors from the college I'll be attending next year: they've always been good with sending and answering emails.</p>
<p>Most colleges have the emails of AdComs on the admissions website and some colleges do take "demonstrated interest" into account in the admissions process. That said, only email if you have legitimate questions that you cannot find the answer for on your own on the Internet. I'm guessing it becomes annoying (and might even hurt you) if you repeatedly email with obvious questions or email just for the sake of emailing.</p>