During the period between the establishment of the post office in Canada in 1763, and the outbreak of the war of the Revolution in 1775, the post office pursued on the whole an even, uneventful course. Canada did not entirely escape the influence of the sentiments which in the older colonies were leading to the Revolution; and, as the war approached, the post office was made to feel the effects.

There were, at the time of the peace of 1763, along with the seventy thousand Canadians which made up nearly the whole of the population, a number of the older British subjects, most of whom had come from the British American colonies. At this time they numbered about two hundred, and when the war broke out in 1775, the number had doubled.

These new-comers to Canada were not without the usual practical ability of Americans, and they very soon gathered into their hands the greater part of the business of the colony. They were, however, a source of much trouble and offence to the governor, and to their Canadian fellow subjects. The governor reported that their arrogance, and repugnance to the social and religious customs of the new subjects—the former subjects of France—as well as the factious opposition they displayed to the mode of government then existing, retarded seriously the progress of the efforts which were made towards conciliating the Canadians to the new regime.

Nothing short of the complete domination of these few hundred English-speaking people over the French Canadians would have satisfied them. The spirit of rebellion grew no faster in the older British colonies than among the few of English extraction in Canada, and the mutual distrust between these people and the government hampered the work of the post office a few years later.

In 1767 Finlay was called upon to remove a certain friction which had arisen between the maîtres de poste and the travelling public. The regulations, which confined travelling by post to persons having special permits from the governor, were no longer insisted upon. Any person desiring to do so was at liberty to hire horses and carriages at any of the post houses for travel to the next post house.

The easing of restrictions enlarged the business of the maîtres de poste. But it evidently did not give unmixed satisfaction, as complaints were made that many persons riding post imposed upon the postmen, "threatening and abusing them contrary at all law."

Finlay had no actual warrant for interfering on behalf of the maîtres de poste, but as postmaster of the province, he had a strong motive for picking up the reins of authority where he found them lying in slack hands. He required the services of the maîtres de poste to help him with the conveyance of the mails, and as those services were rendered for half the charge which was made to the travelling public, he kept the maîtres de poste under his influence by constituting himself their champion. Finlay pointed to the fact that in England the postmaster general was also general master of the post houses, and declared that as deputy of the postmaster general he would take the same position in Canada.

There was the essential difference between the situation in England and in Canada that the postmaster general had statutory authority for exercising control over the post houses in England, whereas there was no such authority for control over the post houses in Canada. However, Finlay was a member of the legislative council, and he assumed, without opposition or question, the charge of the maîtres de poste, and in 1767 issued public notice that the post house system was to be under the same regulations as were in force in England.[76] The maîtres de poste were confirmed in their monopoly, and protected against imposition on the part of the public.

Finlay's energetic management of the affairs of the Canadian post office attracted the attention of his superiors, and as Franklin had resided continuously in England since 1764 as agent for Pennsylvania and other of the American colonies, the expanding scope of the American post office demanded a greater degree of supervision than Franklin's associate, Foxcroft, was able to give.

It was resolved to create another office, until then unknown in America, called a surveyorship. The duties of the surveyor in England are the same as those of the inspector in the Canadian or United States services, and call for a general control over the postal service within certain defined limits. The office of surveyor was established in 1772, and Finlay was appointed to the position. He was allowed to retain his charge of the post office in Canada, though his salary here underwent an abatement.