Stefano

This add-on plugin for bbPress will allow anonymous users to subscribe to topics and get email notifications when a new reply is posted. The notification email includes an unsubscribe link.
bbPress notifications will keep to go out to registered users, this plugin only extends the thing to anonymous posters as well!
See the project on <a href="https://github.com/TheCrowned/bbPress---Anonymous-Subscriptions" rel="nofollow ugc">GitHub</a>.
Available in English, Italian, German, Norwegian, Ebrew, Serbian.

bbPress – Anonymous Subscriptions

A simple plugin to allow anonymous bbPress users to subscribe to topics and get email notifications when a new reply is posted.

bbPress – Anonymous Subscriptions vs Email Tracker