You’ve seen the wedding postcards.

You’ve also probably seen the postcard rules.

You might have even read about them.

If you’ve not, it’s time to start reading the postcards and learn how to get them right.

The rules are simple.

First, choose the right size.

The Postcard Handbook, published by the U.S. Postal Service in 2010, outlines the sizing guidelines for postcards: Postcards must be no larger than 4 1/2 by 7 inches (11.5 by 22 cm) in size.