Bats fly. We don't need no stinkin' drones.

Which is just as well, as mail coming from or going to where I live is so delayed we are a topic of Congressional investigation, which pretty much guarantees that the problem a) won't be identified and b) won't be fixed.

But supersonic communication as to who is to sent what to whom can be achieved. You'll just have to play the messages on Slow, like in that Star Trek (the one you actually see Kirk putting his boots back on sitting on that episode's female's bed)...