What's the difference between "Active" and "Winners"?
When people register onto your list they are put in the "active" list. Optionally, you can move into the "Winner" list. But why would you want to do that?
Imagine you are hosting a competition where every week the top 5 on your list win a prize. Every week you want to reward these 5 people but also remove them from the list so that next week they won't win again.
If you want to send an automated email to the subscribers you move to the Winner list, check the "Promoted email" in the "Automation" page.