There seems to be a lot of confusion regarding the postcard size requirements to qualify for the every door direct mail program. So let me lay it out for you in plain english. There are minimum length and height requirements, but here’s the important part,you only need to meet one. Length or height not both so here are the numbers ready? Your postcard height must be greater then 6 and an 1/8 inches Or the length must be greater than 10 and a 1/2 inches That’s it thanks for watching.