Proton Mail

Anti-Features: NonFreeComp (the application includes non-free components): ⇒ The app contains libraries of Google Mobile Services, Google Play Core, Firebase. NonFreeNet (this application promotes/depends a non-Free network service): ⇒ The app connects to Google servers (Firebase/cloud messaging, PlayStore). ProtonMail is the world’s largest encrypted email service with millions of users. The ProtonMail secure email app for Android brings easy-to-use email encryption to your mobile device by seamlessly integrating PGP end-to-end encryption. ProtonMail also provides a modern user interface with a full set of innovative features such as customizable swipe gestures and the ability to send expiring emails.

With the ProtonMail app, you can:

Create a new protonmail.com email address with automatic PGP key creation and management Send and receive encrypted emails and attachments automatically Set timers for messages to self-destruct after sending Quickly organize emails with customizable swipe gestures and labels Get push notification of new emails Send password protected encrypted emails to non-ProtonMail email addresses Note: the app is using the Sentry.io library. ProtonMail self-hosts the server part, so this is no "third-party" tracking you. Hence the Tracking AntiFeature is not applied.