<p>Decisions are announced online (not emailed) and a copy of the acceptance letter is sent in the mail in a Duke folder. They also send you bumper stickers/other info, and I got a note from my admissions officer. The ED acceptance notification starts off like this:</p>
<p>"Dear xxxxx:</p>
<p>Duke University is now your university - congratulations!" </p>
<p>I remember because I had to read it like ten times before I figured out that I was actually accepted, haha.</p>
<p>Edit: I can’t speak for rejected/deferred students, but the letter that shows up online for accepted students is exactly the same as the one you receive in the mail.</p>