The service was not restricted to letters for delivery within the London area and the surrounding district. Letters which were to be transmitted through the General Post[532] were accepted at any of the receiving offices, and conveyed to the General Post Office in Lombard Street; and letters received in London by the General Post were delivered by the penny post, if for places outside the General Post delivery.[533] This facility proved of much advantage to the public, and led to a large increase in the number of General Post letters. When well established, Dockwra's new system proved profitable and attracted the attention of the authorities of the General Post Office. They contended that the service was an infringement of the monopoly conferred on the Postmasters-General by the Act of 1660,[534] and in 1683, at the instance of the Duke of York, in whom were vested the profits of the General Post Office, an action was brought against Dockwra to restrain him from continuing a breach of the privilege of the Postmasters-General. Dockwra was ordered by the court to pay nominal damages, and was forbidden to continue his penny post. The post was not, however, abolished, but was taken over and managed by the Postmasters-General. Although the service had been decided to fall within their monopoly, the rates charged rested on no legal authority. No statute authorized the conveyance anywhere of letters at the rate of 1d. No authority existed for any rate below the minimum General Post rate of 2d., under the Act of 1660, a state of affairs which continued until the passing of the Act of 1711. A penny rate of postage was then fixed for all letters "passing or repassing by the carriage called the Penny Post, established and settled within the cities of London and Westminster, and borough of Southwark, and parts adjacent, and to be received and delivered within 10 English miles distant from the General Post Office in London."[535] At first the service had included only the cities of London and Westminster, the borough of Southwark, and the immediate suburbs; but the residents in the neighbouring towns and villages, recognizing the advantage of the system, soon asked that it might be extended to include their respective localities, voluntarily agreeing to pay an additional penny on delivery, on each letter. This further charge was at first appropriated by the messengers as their remuneration; but as the amount received by them in this way was found to exceed what might fairly be regarded as reasonable wages, the second penny was in 1687 made part of the ordinary revenue of the Post Office. There was, however, no legal authority for the collection of this additional charge, which remained a voluntary payment until 1730.[536]