How can you tell if a Reader's Digest Sweepstakes is real or fake?

I am just curious how can you tell the legitatmit Reader's Digest Sweepstakes from the scams. I received there envelope in the mail with their logo on it and letters that look legit but I'm wondering how can you tell for sure they are the real deal or a scammer pretending to be them.

How can you tell if a Reader's Digest Sweepstakes is real or fake?
no, those are to trick stupid people


dont do its, its not real its marketing


and impossible to win them.