How to collect accurate opt-in email addresses?

In How can you effectively build a list of email subscribers? we described how to acquire new email addresses for your database. These 8 steps will be explained below.

1. Promote your newsletter prominently on your homepage;
2. Use an email fast lane in your footer or sidebar;
3. Use a pop-up registration box;
4. Use Facebook to promote your newsletter;
5. Apply progressive profiling in order to establish deeper connections with your customers;
6. Use incentives to entice your visitors;
7. Inform your customers properly so that you can win their trust;
8. Use a single (confirmed) opt-in which will result in convenience for your visitors.