<p>Is it still mandatory to send teacher recommendations in a sealed envelope with their signature on the back?</p>
<p>It’s usually better that way especially if you agreed to waive your right to see them :)</p>
<p>Isn’t it done online nowadays?
If your recommender wants to send it via mail, only sealed envelopes. Usually, the recommender signs right where the opening is to make sure you don’t open it.
No matter what the method is, you are not supposed to see what it says.</p>