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Delivering mail through snow and rain, the US Postal Service must now weather technology

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A group of New York postmen set off on foot from the General Post Office to deliver mail in New York City at Christmas, circa 1955.

Updated at 3:29 p.m. ET: The United States Postal Service announced on Wednesday that they will stop Saturday mail deliveries. Email and other forms of electronic communication have made a big dent in the Postal Service's bottom line. From its early start delivering mail on horseback to testing Segways on mail routes, the 273-year-old agency has evolved quite a bit since its beginning.

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A rural mailman travels up a creek bed toward Morris Fork near Jackson, Ky., in August 1940.; K. Ng rides a Segway on his mail route in July 2002 in San Francisco.

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Postal workers sort mail in a Washington, D.C., post office circa 1920.; Bobbi Crump moves mail on a conveyor at the USPS Chicago Logistics and Distribution Center in December 2012.

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Take a look at the how the USPS has evolved since its beginning.