Things You'll Need
Instructions
Build a post office and a blue "International Tunnel" on your train tracks. The post office is required to manage and create post cards, and the "International Tunnel" is required to send and receive post cards to other users on the Internet.
Click on the post office to access the postal system. From the post office, click on the "Pen and Pencil Pot" icon. This will allow you to create a post card.
Click the left hand side of the postcard to create a message. Click the right-hand side of the post card to add the address to which it will be mailed. For the recipient, type "SwapShop@WWW".
Click and drag your postcard to the mailbox icon. Release the postcard over the mailbox icon. A train with a mail carriage car must be attached to the post office track and there must also be a blue "International Tunnel" on your line. Additionally your computer must be connected to the Internet. If all of those conditions are met, your letter will be delivered to a random international recipient
Look for a pile of postcards next to the mailman in the post office. This means that you have received a postcard. Click on the pile of postcards to access the postcard and store it in your postcard album for later viewing.