This is still working on WordPress 4.3 and the latest version of bbpress as of August 2015.
Having migrated from Google Groups where all users receive an email notification on every topic posted, this is a great plugin.
I'm still testing the plugin but works now fine. The plugin conclict has gone because of the solution made by http://wordpress.org/support/topic/plugin-conflict-with-bbpress-notify?replies=3
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