This one’s called Content Upgrades, and it’s a plugin that helps you create content-specific bonuses within your posts — something that people have to opt in in order to see. You first create a special page with the bonus content, then you can customize a little pop-up email form that will advertise what the bonus is, and then you link the pop-up form to the content of the article. So by clicking on that special link, your visitors then get a pop-up.
It’s not just like a pop-up that happens automatically or when they hit the article. They actually have to physically click the link that says “yeah, I want to see more”. Then it pops up and says, “Leave your email address to get the bonuses.” And once they do, the plugin redirects them to the page with the bonus content automatically.
A really nice plugin and it does everything all within WordPress. There’s no crazy Mail Chimp auto responder sequence to have to program or anything like that. It’s all within WordPress — really easy, and I rated this one an 8 out of 10.