Works with K-9
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.
Security / Encryption:
- OpenKeychain - End-to-end email encryption with the OpenPGP standard
These apps used be part of the K-9 eco system but are now no longer available / maintained:
- Android Privacy Guard (APG) - Provided PGP support - replaced by OpenKeychain
- X509Tools - Allowed S/MIME based email encryption in K-9. Note that this application is no longer available on Google Play or supported by it’s developers so may have serious unfixed vulnerabilities (Last release September 2013)
- K-9 Data Killer - Allowed you to manage background sync
- MailListWidget for K-9 - Mail list preview widget
- Email Popup - Popup dialog notification on incoming message
- MetaWatch Community Edition - Displayed received emails on the watch screen, along with an unread count widget