In the us the postal service has media mail, bit this seems low even for that. It's likely they are in a member nation of the UN's universal postal union (192 members!). One of the agreements between members is to deliver or forward on mail from all other UPU members. This can appear initially as a financial loss due to the postage rates and volumes from/to some member jurisdictions, but the members reimburse each other and various fees are assessed. This is a vastly oversimplified explanation, but it's an incredibly convoluted system even after many many revisions. The Wikipedia page for the UPU goes into some history and much more detail. The section Terminal Dues give more detail better than I can. The subsection on Modifications specifically but there are only two relatively brief subsections under Terminal Dues.
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