Postal remailing is the export of international mail to be entered into the mails of a foreign postal administration. Through the combination of services provided by a Public Postal Operator and usually by a private international mailing company remail covers add another facet to postal history. This eGroup compiles information about the processing and the routes of covers and all aspects of postal services that are not provided for by the Universal Postal Union. This eGroup will focus also on remailed tourist postcards.

Currently, PPOs undergo large changes. From being government agencies many PPOs have evolved to become a public corporation or even a corporation under public and private partnership. At the same time, PPOs extend their business to foreign countries following the example set by private remailing companies like DHL, TNT and others that have initiated the globalization of the mail market. These companies offered their services for international mail on a global scale since the mid-eighties.