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In Canada, the Postal Service is operated by Canada Post, there are over 6500 postal outlets in the country, and they can be found in standalone locations or as part of neighborhood stores, Canada Post promises to deliver most letters in two days within a city, three days within a province, and four days within Canada, you can mail a letter at any mailbox as long as your envelope has the right postage, be sure that when you're addressing letters and packages, you write clearly, be sure to include a postal code.
If the destination is within Canada, use your neighborhood post office to mail letters or packages, that need special services, there are different service levels and tracking options available to send your letter or package on the way to its destination, you can buy postal money orders that allow you to send money securely by mail, postal money orders can be used as a check and cashed at banks or a postal, outlet information about the services.
Canada Post provides can be found on their website, for example, finding postage rates locating the nearest post office and learning about mailbox rentals for a fee, you can also manage your mail services through Canada Post either online or at the post office, if you're moving, you can send out a change of address card and have mail redirected to ensure all your mail will reach your new location, if you'll be away for a short period of time, you can have your mail temporarily redirected to your new location locally, or internationally, or you can place a hold on your mail, which will keep your mail at the post office until you return.
Canada Post also has information on their website about customs requirements, that make shipping international packages easier, this can help you complete all necessary paperwork for shipping packages to other countries, including estimating duties and taxes, you can access other government services at the post office, such as tax forms, Canadian passport applications, and student loan applications, who knew the post office had this many services.