CNS TV U.S. Postal Service Inspires Kids to Write WASHINGTON – April is National Card and Letter Writing month. The United States Postal Service is celebrating by issuing a new Forever stamp inspiring kids at the Friendship Public Charter School in D.C. to personalize their heart-felt messages. Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)