EMS is a global postal service that also goes by the Name ‘Express Mail Service’. This cooperative organization delivers documents merchandise on behalf of members of the Universal Postal Union. The Universal Postal Union – or UPU – is an inter-governmental body that operates a universal network of delivery services that reaches more than 200 territories around the world. There are currently 191 members of the UPU, and they all rely on EMS to provide a comprehensive delivery service throughout the world.