I can write ~to John Lee, planet Mars~ as well.

Waiting for your postcards to be delivered is like waiting for the kettle to boil. Most of them will arrive eventually, but you will go bananas in the process.

Sometimes, no matter what you do (send people reminders, resend cards, even resend from a different country) they will not reach their destinations. That's the most frustrating part. After 60 days of non-delivery the Postcrossing site will declare them as "missing in action", or in Postcrossing jargon - "expired". I've got a whole bunch of these expired cards in my sent-list. They're a silent reminder of the futility of my efforts.

I guess that it's a common issue for all the users of the website. Take China for instance. If someone in their postal system wakes up one day, and decides to deliver all the postcards addressed to Chinese Postcrossers, the website will crash for sure. What's wrong with these Chinese people? No-one knows for sure. Either they don't know enough English to read addresses, or the postmen steal the cards to hang on the wall at home, or they forget to acknowledge reception. It's a mystery.