ʺWhat is Postcrossing?It's a project that allows you to send postcards and receive postcards back from random people around the world. That's real postcards, not electronic! Learn more.How does it work?    Request an address and a Postcard ID    Mail a postcard to that address    Receive a postcard from another postcrosser!    Register the Postcard ID you have received    Go to number 1 to receive more postcards!ʺQuelle: Anbieter