When designing a postcard, it is important to consider what the recipient will see first. Mail arrives in a bundle, arranged from smallest to largest piece, and with all the address panels facing forward. Therefore, what the recipient will see first is the side of the mail piece that contains the mail panel. We mention this because most people assume the side without the mail panel is the most important side of the postcard.
There is no requirement that the mail panel take up the entire right hand half of the mail piece. Provided the individual address lines are of standard length, you’ll only need enough room for the outbound address and the USPS-required bar code. By reducing the size of the mail panel, you’ll have space for additional information, a sales message or an attention-getting graphic.