@zeroase @Tutanota @protonprivacy its non-sense. Privacy must be assured by client, and thats what Tuta currently does. Its client makes your data private on their servers, and its open-source. Lack of server-side code just makes it impossible for you to self-host Tuta by your own, which actually makes sense doesnt it? If tuta open-sourced their server-side code they would lose all of their competetiveness, and they would make no money, and would not provide private solutions for you.
Tuta is really foss, but they have to earn money too.