Some postcard companies include lines for the recipient’s address designed to match the front of the card, as in the samples below. The far left sample has a landscape photo on the front of the card, while the near left postcard has a portrait photo on the front. When a 5 x 7 postcard is addressed in the “landscape” style, it requires regular first class postage (44 cents). However, if a 5 x 7 postcard is addressed “portrait” style, it exceeds the acceptable dimensions for first class postage (6-1/8 inches high). Currently, cards addressed in this manner require 88 cents postage.
So, what do you do if the postcard you purchase has a “portrait” style format on the back? You probably don’t want to pay the extra postage, so there is an easy fix – simply ignore the lines the company has printed and instead address the card “landscape” style.
Caveat: I have received postcards addressed in a “portrait” style with 44 cents postage that have made it through the mail system, but more often, I have had to go to the post office to pay the extra postage due.