© 2020 K9-Mail
Many other Android applications build on K-9’s functionality. Searching for K-9 on Google Play will turn up lots of things; here are some of the more useful-looking ones.
End-to-end email encryption with the OpenPGP standard.
Widget displaying configured mailbox or Unified Inbox.
Fancy mail preview and count widgets (paid).
Displays unread mail counter on a home screen.