When you mail a letter or small package (below 4.4 pounds) to another country, the U.S. Postal Service pays what is called terminal dues to the destination post for its share of processing and delivery of the item. It’s the same all over the world. Posts pay each other terminal dues to process and deliver cross-border mail.
No pain no gain. The U.S. Postal Service has reduced spending over the past decade but it has come with a downside, notably a reduction in service. Over the past decade the Postal Service has reduced labor costs by $10 billion, improved productivity, and generally reined in spending.