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What are the correct dimensions for letter size mail?

April 26, 2017dimensions letter mail size

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What are the correct dimensions for letter size mail?

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The maximum size of the mail piece is 6-1/8″ high and 11-1/2″ wide. The minimum size is 3-1/2″ high and 5″ wide. The piece must also be rectangular in shape and fit within the USPS piece aspect ratio (divide length by height equal between 1.3 and 2.5).