Universal Postal Union

The Universal Postal Union (UPU; French: Union postale universelle) is the United Nations specialized agency for the postal sector, headquartered in Berne, Switzerland, and the primary forum for cooperation between the world's postal administrations. Established by the Treaty of Bern on 9 October 1874 as the General Postal Union, it is the second oldest international organization still in existence, after the International Telecommunication Union, and it has 192 member countries.^{1 • 2}

Origins

Before the nineteenth century, international mail was governed by a web of bilateral postal agreements between pairs of countries. By the 1800s this system had become so complicated that it impeded growing trade, and simplification was needed.³ National reforms pointed the way: in England in 1840, Sir Rowland Hill introduced prepaid postage and uniform domestic rates for letters of a given weight regardless of distance, and is credited with the world's first postage stamp.³

A first attempt at international coordination came in 1863, when United States Postmaster General Montgomery Blair called a conference in Paris. Delegates from 15 European and American countries laid down general principles for mutual agreements but could not settle an international postal treaty.³

The Treaty of Bern. The decisive step came from Heinrich von Stephan, a senior postal official of the North German Confederation (later General Post Director for the German Empire), who drew up a plan for an international postal union. At his suggestion the Swiss Government convened a conference in Bern on 15 September 1874, attended by representatives of 22 nations. On 9 October 1874 the delegates signed the Treaty of Bern, creating the General Postal Union and a single postal territory for the reciprocal exchange of letters; that date is now celebrated worldwide as World Post Day.^{3 • 1} Membership grew so quickly that the name was changed to Universal Postal Union in 1878.³

Two founding principles shaped the network. From 1874, postage rates for correspondence across the entire single territory were uniform and fixed by the UPU Congress, replacing the complex scales of the bilateral era. A second principle, reciprocity or non-sharing of charges, held that each country handled incoming foreign mail without payment, except for transit charges; this worked while mail flows were roughly balanced, but over time some countries found they received far more mail than they sent, a imbalance that later drove the terminal dues debate.¹

Structure and governance

The UPU consists of four bodies.²

• Congress is the supreme authority and meets every four years; plenipotentiaries from the 192 member countries decide the strategy and set the rules for international mail exchanges.⁶
• The Council of Administration has 41 member countries, meets annually in Berne, ensures continuity of work between Congresses, and studies regulatory, administrative, legislative and legal issues.⁷
• The Postal Operations Council (POC) is the technical and operational body, with 48 member countries elected at Congress, dealing with operational, economic and commercial matters.²
• The International Bureau fulfills the secretariat function, providing logistical and technical support to the other bodies.²

Membership follows the UN link: any United Nations member may join, and a non-UN country may be admitted if at least two-thirds of UPU members approve its request.² Union expenses are shared through a contribution class system in which new members choose one of ten classes from one to 50 units, with a half-unit class reserved for the least developed countries.⁸

The Union's acts form a treaty structure. The Constitution, adopted at the 1964 Vienna Congress and amended through eleven Additional Protocols (most recently at the Abidjan 2021 Congress), contains the organic rules and is not subject to reservations. The General Regulations ensure its application, and the Universal Postal Convention sets the rules applicable throughout the international postal service, binding on all member countries, which must ensure their designated operators comply. A separate optional treaty, the Postal Payment Services Agreement, governs postal financial services for its parties.⁹

What the UPU does

The UPU sets the rules for international mail exchanges, develops technical and quality-of-service standards, regulates worldwide traffic of international mail, monitors market trends, and provides technical assistance and development cooperation. Its stated constitutional mission is "to stimulate the lasting development of efficient and accessible universal postal services of quality in order to facilitate communication between the inhabitants of the world."^{4 • 5} Its Standards Board develops technical standards and electronic data interchange messaging specifications that let postal operators exchange operational information, and since 2001 the UPU and the European Committee for Standardization have recognized each other's postal standardization work.¹⁰

The physical network it coordinates is large. The UPU factsheet describes the Post as the largest physical network in the world, with more than 677,000 outlets and about 5.3 million staff, giving access to governmental, financial and trade services even in remote areas. In 2016, 303.2 billion letter-post items and 8.9 billion parcels were exchanged, and postal revenue split roughly 39 percent letters, 23 percent parcels and logistics, 18 percent financial services, and 20 percent other categories.⁴

Terminal dues

The UPU's remuneration system for letters and small packets, known as terminal dues, compensates the designated operator of the destination country for the handling, transportation and delivery of items sent from another country's operator. Adopted by the 1969 Tokyo Congress and introduced on 1 July 1971, terminal dues began as a simplified payment for weight imbalances in mail exchanges and evolved toward payment for work performed, measured by items delivered, for the largest mail flows.^{11 • 1}

The system became contentious with the growth of e-commerce. Because rates were set in tiers reflecting countries' levels of development rather than actual delivery costs, designated operators in industrialized countries charged substantially less for delivering inbound letter post, particularly e-commerce packets, than they charged domestic mailers for similar services. The U.S. Postal Service's analysis found that inbound terminal dues rates did not cover its delivery costs, and its net losses on this mail more than doubled between 2012 and 2016, while outbound terminal dues mail produced net positive revenues.¹²

The dispute peaked in 2018, when the United States announced it would leave the UPU unless rates were reformed. At an Extraordinary Congress in Geneva in September 2019, member countries approved a solution that reformed the terminal dues system and allowed the postal network to continue functioning; the 2019 Congress revised rates for bulky letters and small packets (E format) and approved self-declaration of these rates, applied to flows with the United States from 1 July 2020 and open to all members from 1 January 2021.^{13 • 11}

Recent developments

Dubai Congress 2025. The 28th Universal Postal Congress met in Dubai from 8 to 19 September 2025 and adopted the UPU Strategy 2026–2029 (Dubai cycle) together with its roadmap, the Dubai Business Plan. The strategy aims to reposition the postal network as part of the digital economy, structured around three goals: leveraging the single postal territory through an effective rules-based system, strengthening the global postal ecosystem through innovations for communication and trade, and enabling postal development through enhanced cooperation and regionalization. It replaces an outputs-based approach with results-based management that evaluates outcomes.^{5 • 14}

The 2025 U.S. customs shock. When the United States ended its "de minimis" exemption, which had spared parcels valued at $800 or less from duties, postal traffic into the country came to a near halt after the new rules took effect on 29 August 2025, falling more than 80 percent from the prior week. Eighty-eight of the UPU's 192 member countries suspended some or all postal services to the United States while adjusting their procedures, and the UPU began rolling out technology, including an API through its Customs Declaration System, to help operators calculate, collect and remit the required duties to U.S. Customs and Border Protection. Five weeks later traffic remained about 70 percent below the pre-change level.^{15 • 16}

The organization marked its 150th anniversary in 2024 and 2025; its magazine Union Postale has been published without interruption since its first edition in 1875, and in 2025 the UPU also marked 150 years of postal statistics.^{17 • 3}

References

1. The Postal History of ICAO: ICAO and the Universal Postal Union, ICAO
2. Universal Postal Union, About UPU
3. History, Universal Postal Union
4. Factsheet: About the UPU, Universal Postal Union (2018)
5. Strategy, Universal Postal Union
6. Congress, Universal Postal Union
7. Council of Administration, Universal Postal Union
8. Member Countries, Universal Postal Union
9. Acts of the Union and other decisions, Universal Postal Union
10. Standards, Universal Postal Union
11. Terminal dues, Universal Postal Union
12. International Mail: Information on Changes and Alternatives to the Terminal Dues System, GAO-18-112 (2017)
13. Annual Strategy Review 2020, Universal Postal Union
14. UPU adopts new four-year strategy, Universal Postal Union (2025)
15. Postal traffic to US sank 80% after Trump administration ended exemption on low-value parcels, AP News (2025)
16. Postal traffic to US still down 70% five weeks after duties exemption on low-value packages ended, AP News (2025)
17. 150 years of the UPU, Universal Postal Union

Topic: Encyclopedia › Society and history › Politics and government › International relations › Foreign policy and state relations › Intergovernmental organizations › Environmental and technical/scientific IGOs

Initially written Sep 17, 2026 · Reviewed: Oct 25, 2026 · Edited: Oct 15, 2026; Oct 25, 2026 · Last review: Oct 25, 2026

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