When did you last time receive a letter? Not an electronic message but a letter that was written on paper by hand?
9 October marks the World Post Day. It was established by the Universal Postal Union at a congress in Tokyo in 1969 to highlight the importance of the postal services.
If you think that in the era of the Internet postmen are no longer needed, have a look at our photo gallery to realise how mistaken you have been.
A female skin-diver puts a plastic letter into a post box set up at a depth of 10 meters on bottom of the sea off the coast of Susami, Wakayama Prefecture 07 July 1999.
A postman stops and looks at a flooded street in Lowestoft, in the east of England, on December 6, 2013 after a tidal surge hit locations along the east coast of Britain.
Germany's most northerly post skipper Fiede Nissen, left, and his colleague Andreas Oberauer who is said to be Germany's most northerly postman bring packages and letters to the residents of the tiny island of Groede in the North Sea on Tuesday, Dec.5, 2006.
Australia postman George Johnstone pauses for a quiet moment with his two-year-old pet Cockatoo Bob as he delivers the mail in the Hunter Valley town of Aberdeen, in New South Wales, 03 January 2008.
A Chinese postal worker leaves with his bike after delivering mail to a fashion salon decorated with a porcelain dog drinking a US soda out of a straw 16 February 2000 in Beijing.
The postman goes on with his round despite floods in the village of Chanxhe, near Liege, 28 January 2002, after heavy rains caused floods in many areas of Belgium.
A helmeted postman on a motorcycle rumbles past flattened buildings at Wajima, one of the areas hit hardest in Ishikawa prefecture (state), northern Japan, on Monday March 26, 2007.
A postwoman brings mail to residents of Borovoye village in Russia's Novosibirsk region.
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