ProtonMail

1.13.30

ProtonMail is an email client that promises complete security for its users with the help of powerful encryption. Read more about ProtonMail  

The most important feature ProtonMail is its ability to encrypt messages, which means that only the sender and the recipient can read those emails. For anyone else intercepting those messages, the content would be gibberish.
 
ProtonMail features PGP end-to-end encryption, and the interface of the email client is intuitive and easy to use. All the features that you’ve been using until now in other apps are present, such as swipe gestures for example.
 
The application promises online privacy, and the developers of the app say that anyone with access to the ProtonMail protocols and servers won’t be able to make sense of the messages. Also, the application is completely open source, and ProtonMail is hosted entirely in Switzerland.