Subscribe user to list I have a forum site and I need sign up user list (on profile page). So every user should sign up for new forum posts. Basically, I need a user group which I can attach in rules and send them email with new thread details.

Is there a module for this or do I need create a custom module? If I need my own module is this a good solution - Create content type "user_list" and attach users to nodes via user reference field. Then in Rules settings I will attach this user_list and send email to all users(via user refernce) in this node. Or is there a better alternative?

Thank you for response
Have you already tried to use Organic Groups and Notifications ?
There is also Organic groups e-mail blast module I didn't try.