The post office likes to make believe that it’s a real business with ridiculous gimmicks like its “forever” stamp and talk about being “competitive” in the market. But that can’t change the fact that the post office is an outrageously inefficient government monopoly, which exists only because the law protects it from real competition or even the consequences of its perpetually poor management.
Strip the post office of its special privileges. Then we would see what kind of “business” it’s capable of. In all likelihood, under those circumstances, it would quickly become extinct.