E-Mail notification without default switch to 'On' for each user

Hey there,

I am really sorry for coming back to this topic again. My members demand e-mail notifications more and more and I can not serve this due to the way the options works at the moment. My plans were to offer at least push notifications through the app but you know the neverending story about the app...

When I switch on e-mail notifications for conversations i.e. every member will have it turned on and needs to turn it off in case they do not want e-mail notifications.

I need it the other way round. I want to switch the notifications on in the backend and have it set to no as per default for users. But each user can switch it on if he wants to.

This is very important to be this way around, because german law presumes an acceptance for e-mails before sending them. Switching it manually to yes by each user would be such an acceptance...

Is there ANY way to realize this?