It's good to start with distrust of any company, but at the end of the day you have to choose one of them. All of the top privacy researchers I listen to trust Proton, and ProtonMail's code is open source (https://protonmail.com/blog/android-open-source/). The other alternative is Tutanota, which is also open source.
Hi Glenn, Proton is connected with M.I.T. I don't trust them. - Tom
It's good to start with distrust of any company, but at the end of the day you have to choose one of them. All of the top privacy researchers I listen to trust Proton, and ProtonMail's code is open source (https://protonmail.com/blog/android-open-source/). The other alternative is Tutanota, which is also open source.
Thank you.