It is almost obvious to say that, since writing has existed, correspondence has existed. However, it is well known that the first postal system was invented in ancient Persia around 550 BC , during the reign of Cyrus the Great .
The Persian ruler ordered each province of the kingdom to organize a postal delivery and shipping system for the citizens, had dedicated roads built across the nation, and even tried to persuade neighboring states to do the same.
Xenophon talks about it in his works, describing it as based on the hypothesis of a horse traveling within 24 hours and on the basis of which special stables were built. Along the entire route there were 111 stations and the messengers they managed to cover the entire distance in 9 days .