Ltt.rs is a beautiful, user friendly and encrypted by default E-Mail client for Android based on modern standards like JMAP (RFC 8621) and Autocrypt.
Using JMAP instead of IMAP will make the app more maintainable and more reliable on current mobile operating systems due to the build-in push capabilities.
Not available yet
Attention: You need a JMAP capable mail server to use Ltt.rs You can download Ltt.rs either from F-Droid, or for a small fee from Google Play.
NGI Project: NGI pointer