I have a WP+BBP installation for few months. The forum subscriptions worked well until recently – it sent e-mail notifications for users subscribed in a particular forum or topic as expected. Now it doesn’t send any e-mail. Any other e-mail notifications (user registration, password change etc.) are working well. I tried to create two bare new installations of WordPress with bbPress and no other plugins. It is working like my existing WP+BBP – all e-mail notifications are working well, except the new forum/topic notifications.
BTW, where can I find the subscriptions/notifications setttings? I can not find it. I can just check this one checkbox in Forum Features:
Subscriptions  Allow users to subscribe to forums and topics
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