FAQ's here.

Q: What is The Postcard Club?
A: A quarterly postcard subscription service that makes it easy for you to send kind notes to friends and former strangers.
Q: How does it work?
A: When you join the club, you receive 4 beautifully designed postcards and stamps at the beginning of each quarter. The rest is up to you, just write a kind note and pop it in the mail.
Q: Who designs the postcards?
A: Each package will highlight an artist’s work on the front. The back will have plenty of space for your message and an area to fill in your friends address.
Q: Do I have to subscribe?
A: No, you can purchase a one-time package of 5 postcards.