Reply To: Notifications not working
or if a new user registered for the forum
Getting a notification for a new user registering is from the core of WordPress. If you do not seem to get any notification at all on your site, you may need to contact your host for help on this.
Again if you do not seem to get any or some of these below notifications you may need to contact your host.
New Comment / Comment Awaiting Moderation
New Trackback
New Pingback
Lost Password
New User Registration (For Admin)
If you do get some, then we have to do more troubleshooting(which could possibly be a plugin issue) and some possible bug finding in bbPress.