Sending postcards by mail used to be a great way to communicate with friends and family while traveling or on vacation. It was an opportunity to let others know that you are thinking of them and sharing a small piece of your traveling with them. Sending traditional postcards is becoming obsolete, but sending postcards through apps is something that’s more widespread. If you are looking to send postcards to friends and family then check out our list of the best postcard apps for the iPhone.