A few notes - please read carefully:
You will be given a Postcard ID that you must write on the postcard - the recipient will need it to register your postcard on this website.
A copy of the address you should mail the postcard to will be sent to your email account.
You should read the Community Guidelines before exchanging any postcards.
With this option selected, your postcards will often go to the same few countries, which are the most active ones in Postcrossing.