Today the entire world, including India has best Postal Services. But what about centuries back?
It is written that in 6th Century BC Cyrus, the King of Persia had established a Postal system through horsemen. It helped him in the Scythian war. He built stages on the route so that the horse and man can refresh and start again or change the horse and man. In China, very early postal system existed.
Many kings used many methods for conveying news.