Sir, that is because the mail is a cornerstone. There are so many ways to communicate, but you cannot simply dispose of one of the most fundamental aspects of a civilization! Calling another person on the communicator is a wonderful and quick way to speak with someone, of course, but there is no way to beat the beauty and feeling of a hand-written letter or invitation! It is a memento, a physical memory, a papery and hand-held moment locked in the ever-crystallizing amber of time.