If I send a letter or postcard from the UK to the USA, who gets money from my stamp?

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Who gets the money from my stamp when I mail a letter or a postcard (via Mailform or Docupost for example) from the UK to the USA or vice versa? If it’s the UK, how does the airline or the postman in the US profit on my letter? Also, Are they obliged to deliver it for free once it reaches the other country because they receive no direct payment from me? How can international mail help recipient countries make money?

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