After getting a new newsletter addon coded I noticed that at this moment Phoenix doesn't have the ability to filter or any way of separating the customers that have opted in to receive newsletters. That's the beauty of open source so the community can solve things like this
I need an sql query that will select the customers that have opted in to receive newsletters. Also, I think @raiwa's guest checkout allows customers to opt-in to newsletters.
The purpose is to start capitalizing on past customers via internal marketing.
Thanks for your help. Happy New Year.
EDIT: Does Phoenix's current Newsletter infrastructure has a way to unsubscribe or subscribe in case past customers change their mind?
The reason I asked is because you may be able to entice past customers to subscribe or become a repeat buyer by offering an incentive.