Email Campaigns
Before email marketing came along, most companies used direct mail. Now with email, you can set up a large targeted email advertising campaign, create several test emails, to a small sample test to see whaich version does the best, and then blast out that targeted double opt-in marketing gem to thousands or even millions of people. Yes, technology makes it easy these days where people before had to spend much more money, expend much more effort, and receive so much less in return.