USPS requires that EDDM® mailpieces qualify as flat-size "Saturation Standard Mail", a specified USPS-defined format. Click2EDDM offers EDDM® mailers in four sizes: 6.5 x 9, 6.25 x 11, 8.5 x 11, and 8.5 x 12. Free templates are available here.
If you have additional questions, please contact Click2Mail Customer Support at 866-665-2787 or firstname.lastname@example.org. Our hours of operation are Monday - Friday, 9 AM to 8 PM Eastern.