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EDDM must fit with a preexisting range of dimensions to be shipped. Mail must be rectangular, and a minimum of 11.5" long OR 6.5" wide OR .25" thick, and a maximum of 15" long OR 12" wide OR .75" thick. Additionally, each mailpiece must be at least 0.007” thick (approx. 3 sheets of copy paper) and cannot exceed 3.3 ounces. https://about.usps.com/postal-bulletin/2011/pb22312/html/info_005.htm