~~~ when you want to be certain that the mail is delivered to the exact person you want to receive it and not just anyone at the delivery address... though it does carry an additional charge. Otherwise, anyone can accept the mail and even sign for if if "Return Receipt" is purchased.

If it's addressed to Joe Greene, at 234 Red Rd... only Joe Greene can accept the mail either at that address or at the post office where it returns being placed under lock and key...