I would bring up my idea to work with s2Member Plugin,
When a visitor come to my website and read some topic then I would allow them "Subscribe" to mailing list just by put their "email address" and submit it. (of course, I need short code to put that subscription box at my front page or any page I want)
The system will send an email to subscriber email for verification and/or register process (for paid content).
With s2Member, I can understand that user have to register first then the system will integrate with mailing list and will work with other s2Member functions.
Do I need separate Plug-in for email subscribe? and how I integrate with s2Member ? Please advice