Answer: There’s an organization called the Universal Postal Union that coordinates this between countries. A lot of the time, they just say “ok, we get a lot and also send a lot, it mostly equals out, we’re all good.” Other times a country says “hey, we get a TON of mail from your country but we don’t send any, you should pay us.” But they basically settle up every so often based on the totals throughout the year instead of trying to pay each other a tiny amount with every letter.
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