Rules of Follow an item and Unfollow

Hi,

In an item like request, there is the discussions Panel.
By default, if I'm member of this request I'm automatically 'Following' the request.
In discussions, when a discussion is opened I can unfollow the discussion using the link on the notification mail.
But if there is another new discussion, I will receive a new notification mail.

I suppose that if I click on following button on the request, I will not receive any notification mail from this request. But it's not work.
Have I missed something ?

Regards,