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http://teachmate.org/what-is-list-building/

So, what is list building? List building is the process of adding new subscribers to your mailing list. This subscriber gives you their email address in exchange for receiving certain information, a special offer, or a free gift. You can do this online via your website, or you can do it offline using manual or automated data collection tactics. There are various tactics you can use to increase how fast you build your list, and how large your mailing list ends up being.