But in spite of the determination of the postmaster general that no expenditure should be made for postal service, which did not promise an immediate return equal to or greater than the outlay, the country was growing too rapidly to permit of any great delay in providing increased facilities for correspondence. While the post office held on to the monopoly in letter carrying, it had to make some sort of provision for doing the work itself.

In 1815, when peace had been concluded with the United States, Sir Gordon Drummond, the commander of the forces, and administrator of Canada, directed Heriot to arrange for two trips a week between Montreal and Kingston, Heriot invited tenders for this service, and was dismayed to find that the lowest offer was for £3276, an amount double the anticipated revenues.

With his instructions from the postmaster general before him, an outlay of that magnitude was not to be thought of, but Heriot did go the length of authorizing weekly trips over the whole route between Montreal and Niagara and arranged for fortnightly trips to Amherstburg from Dundas, a village on the grand route between York and Niagara.[160] The mails were carried between Montreal and Kingston by coach; between Kingston and Niagara on horseback or by sleigh; and between Dundas and the settlements at the western end of lake Erie on foot.

In reporting these arrangements to the postmaster general, Heriot explained that, with the close of the war, military expresses had been discontinued, and it became necessary to provide additional accommodation to the commissariat and other military departments, but the increased postage more than covered the expense incurred.

In March 1816 the lieutenant governor of Upper Canada pressed for further improvements in order to facilitate communication between the several courts of justice and every part of the province, so that notices might be sent to jurors and others having business with the courts.[161] In concluding his letter to the general post office recommending the application of the lieutenant governor, Heriot added that there was a strong desire on the part of influential people in Upper Canada that there should be a deputy postmaster general for that province, as well as one for Lower Canada.

Heriot favoured the idea and recommended William Allan, postmaster of York for the position. The postmaster general, however, disapproved of the proposal of an independent deputy for Upper Canada. He agreed with Heriot that there would be advantages in having an official residing in Upper Canada with a wider authority than that ordinarily exercised by a mere postmaster, but thought that the postmaster of York might without change of title be made to answer all the requirements of an assistant to the deputy postmaster general.

Before leaving the service in Upper Canada, an incident should be mentioned, showing the difficulties military men stationed far from a post office had in corresponding with Great Britain. At the end of the campaign of 1813 in the Niagara peninsula, the officers of the right division, which was quartered at Stoney Creek, presented a memorial to the governor general laying before him their hard case, and praying for relief.[162] They desired to write to their friends and relatives at home, but could not do so, owing to the post office regulation which required that all letters sent to Great Britain should have the postage paid on them as far as Halifax.

The sea postage did not require to be paid, as that could be collected from the person receiving the letter, but unless the letter was fully paid to Halifax, it was detained and returned to the writer. As the nearest post office in operation was York, nearly fifty miles away, and as they had no acquaintance there or at Montreal or Quebec, who might pay the postage for them, they were without the means of relieving the anxiety of their parents, wives and others who could not learn whether they were alive or not. They asked that a bag be made up monthly, as Lord Wellington did from Portugal, and sent free of expense to the Horseguards in London, from which place the letters might be carried to the post office for delivery.

The postal service in Lower Canada and eastward underwent no change from the time of Heriot's accession to office until the war of 1812. As in 1800, the couriers between Montreal and Quebec still left each place on Monday and Thursday mornings, and meeting at Three Rivers, exchanged their mails, and returned, reaching their points of departure two days later. The mails between Quebec and Fredericton continued to be exchanged fortnightly in summer, and monthly in winter, and between Fredericton and St. John, and St. John and Halifax, there were weekly exchanges as in Finlay's time.

Lower Canada still found its principal outlet to Great Britain in the weekly mail carried between Montreal and one of the towns of the United States near the Canadian boundary. In 1810, the place of exchange of mails between Lower Canada and Boston and New York was Swanton, a small town in Vermont.