[_ck_]

You can manually mark spam posts with my “Mass Edit” plugin.

https://bbpress.org/plugins/topic/mass-edit/

There are two email notification plugins available, one is the “post notification”

https://bbpress.org/plugins/topic/post-notification/

https://bbpress.org/plugins/topic/auto-add-favorites/

and the other is my “subscribe to topics” (which is not robust yet).