http://tutacomm6oqwlbbpd246mljjxpupuxxqj2jg5mfdyegeaetdauigslad.onion/blog/seven-years-open-source-email
Open source allows third-party validation Because of this, encrypted email or messaging services can only prove that they are truly end-to-end encrypted by publishing the
client code as open source. So far, Tutanota has published its web client, its Android and iOS apps and its desktop
clients as open source. The Android app is completely Google-free, which enables us to publish it on F-Droid as well.