Excerpts from Books and Wikipedia
"The Universal Postal Union (UPU, French: Union postale universelle), established by the Treaty of Bern of 1874, is a specialized agency of the United Nations (UN) that coordinates postal policies among member nations, in addition to the worldwide postal system. The UPU contains four bodies consisting of the Congress, the Council of Administration (CA), the Postal Operations Council (POC) and the International Bureau (IB). It also oversees the Telematics and Express Mail Service (EMS) cooperatives. Each member agrees to the same terms for conducting international postal duties. The UPU's headquarters are located in Bern, Switzerland.
French is the official language of the UPU. English was added as a working language in 1994. The majority of the UPU's documents and publications – including its flagship magazine, Union Postale – are available in the United Nations' six official languages (French, English, Arabic, Chinese, Russian, and Spanish)." [Wikipedia]