How are disputes over lost registered or insured international mail settled?

Disputes between postal administrations regarding the allocation of liability for the loss of registered or insured international mail are settled through arbitration.1

These procedures are governed by the Universal Postal Convention, which serves as the foundational regulatory framework for the Universal Postal Union (UPU). The UPU, a specialized agency of the United Nations, facilitates international cooperation and ensures that member countries operate as a single postal territory for the exchange of mail. While the UPU provides the structure for these rules, the specific resolution of liability disputes remains a formal process of arbitration between the involved national postal authorities.21