Notification email for all users

Hello,

I have a question for you :
Why any visitor can open a topic and write a response, while only REGISTERED and CONNECTED users (with username + password) will have access to the box for reply notification by mail?

I would like the mail notification is ok for all users, registered and not registered users.
To date, no response obtained in any forum, and no plugin found …

Is it possible for you to write a plugin with this option in the panel settings, please ?

Excuse me for my english.

Best regards
Alain
My Website : https://www.modelisme-racer.fr

https://www.ads-software.com/extend/plugins/bp-forum-notifier/