I met a lady who said she received a notice in the mail from a company offering plaques of various animals. She knew her daughter would love them as a gift and ordered them. This lady said, "I don't know how they got my name but I sure am pleased to have found out about those beautiful plaques, my daughter just loves them."
THAT is direct mail advertising at work.
If you have a product or service that needs exposure you can mail 1,000 or more sales messages at reduced postage rates. That's a savings of at least 14 cents on lettersize and 51 cents on oversize for each piece by using Canada Post's Addressed Admail