Remember the 1997 post apocalyptic movie starring Kevin Costner (no, not that one - the other one) about a guy in dystopian America who puts on a dead postman's uniform and starts to deliver the mail? He explained his actions by saying something like, "There used to be a postman on every street in America... Getting a letter made you feel like you were part of something bigger than yourself. I don't think we ever understood what they meant to us until they were gone."
In "The Postman" (based on a novel of the same name by David Brin), the United States Postal Service (and the United States, for that matter) were decimated by some catastrophic global nuclear war and not by competition from the Internet and an Act of Congress requiring the Post Office to pay $5 billion a year for 10 years to cover future health benefits of all of its employees (something no other organization has ever been required to do nor has ever done).
And when did this post apocalypse supposedly take place? 2013.