Our goal with Tutanota is to offer the most secure email service. The built-in encryption is a good start, but as this post explains, there is more to secure email than just encryption: https://tutanota.com/blog/posts/secure-email-service
@Tutanota article said "Tutanota pays attention to seemingly little details, such as not using third-party code"
The thing is, Tutanota is just as much a 3rd party to users as anyone else. The f-droid app is a great thing, but what about desktop users, who will be S.O.L after Electronmail drops Tutanota support?
@resist1984 We have our own open source desktop clients, which are also published as open source. No need to trust others with your secure emails. ;)