I have received this envelope from Phillip (the USA) last Friday. Just in time! Because it is a letter to the future (Cf. the MA Dictionary). See what is stamped on the back:
Actually, this is also a post to the future, an scheduled one. That means that I am writing this before the due date. I have not opened the letter yet, and therefore I have not seen the content yet.
I wonder how Mr Munez can wait to open more of 200 letters...!
(Also published here)