The USPS defines two standard postcard sizes: 3.5" x 5" and 4.25" x 6". The length of a postcard must be parallel to the address lines,...

Postcards are an affordable way to get your message out to the masses. Postcards do not require folding or an envelope, and they can be...

Before the advent of postage stamps, international mail relied on private shipping. Before 1840, international shipping required the use...

If you want to build a website that integrates Postal Service services, you should take advantage of the U.S. Postal API. This API allows...

Postcards come in a variety of sizes. Typically, standard postcard sizes offer the most room for one large image, a call to action, and...