Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
I'm trying to accomplish this following:
1) A specific level of member are, by default, opted IN to the members only forum posts and comments
2) That same specific level of member can OUT out of receiving emails from a single post's comments, but not all comments
3) General members can opt IN to receive notifications for a post or thread, and then subsequently opt out.
Also, I'm trying to receive email notifications when somebody applies to be a member - that's not working either. I've seen a few threads about this but no clear path to resolution.