bodab97787 I have taken a look at it, and it looks interesting, we will investigate it further in the future, but at first glance it is a potential software to add to our list.
Regarding Proton, I believe you can remove the "Spam" or update and service notifications from your account settings, in the account settings, under Basics > Control Panel > Email Subscriptions. About Tutanota, no idea, I don't use Tutanota too much.