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 says it also plans to increase domestic rates for mail heavier than 30 grams.

Answer: industry