Utilize the input text as a context reference, choose the right relationship between Canada Post and mail from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Canada Post is proposing to increase both domestic and international postage rates next year in a move it says is necessary to offset a continuing decline in mail volumes.

Answer: industry