There is an organization called the Universal Postal Union, and their entire job is to make sure you’re able to send a letter from one place to another while only using the stamps from your home country. The UPU has a gigantic list that lets postal services from around the world know how much it will cost to send a letter from anywhere to anywhere, and it lists exactly what routes a letter or package can take to get from anywhere to anywhere. Each country along the route gets a share of that price depending on how it was carried, for how long it was carried, how it actually gets delivered in the destination country. Some of the money goes to the company that transported it from one country to another, some of the money goes to the countries that handled it in between, some of that money goes to the postal service in the country where it was delivered, etc.
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