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The mail or post is a system for physically transporting postcards, letters, and parcels. [1] A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal systems have generally been established as a government monopoly, with a fee on the article prepaid.
Canada Post provides a free postal code look-up tool on its website, [1] and its mobile applications. [2] Many vendors also sell validation tools, which allow customers to properly match addresses and postal codes. Hard-copy directories can also be consulted in all post offices, and some libraries.