The first country to use a formal postal service is widely regarded as Persia (modern-day Iran) during the Achaemenid Empire around the 5th century BCE. The empire implemented an efficient communication system known as the “Angarium,” which utilized mounted couriers to deliver messages across vast distances. This system allowed royal decrees, military orders, and news to be transmitted swiftly throughout the empire. The Persian postal service has been influential in the development of postal systems in other cultures and later inspired similar systems in different civilizations, contributing to improved communication and administration in the ancient world.