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What are the dimensions for letter-size mail?

April 26, 2017dimensions letter-size mail

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What are the dimensions for letter-size mail?

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Letter-size mail can be as big as 6 1/8″ high and 11 1/2″ wide or as small as 3 1/2″ high and 5″ wide. It must also be rectangular in shape and meet the USPS piece aspect ratio: length of the piece divided by the height mus be between 1.3 and 2.5.