Yeah, we received like 2-3 letters from JW. Extremely annoying.
But it’s good that you don’t send postcards like these. Postcrossing is not a place for that, I’d also like to point out that if you ever would do so, you may get warning or even your account may get suspended.
The person who send me a letter with a postcard got a warning from moderators.
Here is a whole discussion about that: