What version of bbPress Notify (No-Spam) are you using?
What does your Topic email template look like (under Settings > Forums > Email Notifications)?
Are you sure you’re running version 1.1 of the Bridge plugin (sorry, I have to ask)?
Is the forum set to Private?
Regardless of the answers above, I’m releasing version 1.1.1 with a small change that may or may not impact your case.