World Post Day is celebrated each year on 9 October, the anniversary of the establishment of the Universal Postal Union (UPU) in 1874 in the Swiss capital, Bern. It was declared World Post Day by the UPU Congress held in Tokyo, Japan, in 1969.
The purpose of World Post Day is to create awareness of the role of the postal sector in people’s and businesses’ everyday lives and its contribution to the social and economic development of countries. The celebration encourages member countries to undertake programme activities aimed at generating a broader awareness of their Post’s role and activities among the public and media on a national scale.
Every year, more than 150 countries celebrate World Post Day in a variety of ways. In certain countries, World Post Day is observed as a working holiday. Many Posts use the event to introduce or promote new postal products and services. Some Posts also use World Post Day to reward their employees for good service.
(in reference from Universal Postal Union).