Email Marketing: Why Build A Mailing List?

You’ve got a business, you’ve got advertising, you’ve got stationery, you’ve got good word-of-mouth, you’ve got steady customers, you’ve got a website. Why do you need a mailing list?
You’ve got a business, you’ve got advertising, you’ve got stationery, you’ve got good word-of-mouth, you’ve got steady customers, you’ve got a website. Why do you need a mailing list?