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An overseas mail service has been in operation since 1580, before the establishment of the public postal service. A staff of ten Royal Couriers carried letters on affairs of State, or on the business of 'particular merchants' to Dover. At Dover, the postmaster provided horses for returning couriers and vessels for those passing through to Calais.

In 1619 the office of Postmaster General for Foreign Parts was created.

The mail service with foreign countries was not large in the seventeenth and eighteenth centuries. The foreign Post Office, as it was called, had a staff of only four men in 1660. At the time of the Napoleonic wars, the Foreign Office business was barely accounting for 10% of the total net income of the Post Office. Postal connections with other countries were irregular and difficulties were experience in the capturing of letters arriving in ships and in the collection of profits. From the 1690s the government attempted to resolve these problems and extend the service by means of convention with the postal administrations of other countries for the establishment of an overseas service. The Overseas Air Mail service came into operation in 1917, thus after this date the conventions are between The Post Office and overseas postal administration for the transportation of mail by air. These can be found in POST 50/1.