The story
Founded by Vatican City on Feb 11, 1929.1
The use of stamps was introduced in the Vatican in 1852.
Poste Vaticane was created in 1929 following the Lateran Treaty. It started operations on 1 August 1929 (or February 1929), and the Vatican joined the Universal Postal Union on 1 January 1929. Its yellow mail boxes became iconic in the landscape of the papal city. The Poste Vaticane also handled the state's telegraph communications. The air courier system was set up in 1938. The Poste Vaticane joined the European Conference of Postal and Telecommunications Administrations in 1965, and PostEurop in 2012.
In 2020, a law was passed to merge the philatelic and postal activities of the Poste Vaticane. In September 2020, the Poste Vaticane released a stamp picturing the coronavirus.
From Wikipedia’s article on Poste Vaticane, shared under CC BY-SA 4.0.3
