K-9 Mail

K-9 Mail

Full-featured email client

Email Internet

Download (10 MB) Website

Screenshots

Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail Screenshot of K-9 Mail

Description

K-9 Mail is an open source email client that works with basically every email provider.

<b>Features</b>

* Supports multiple accounts
* Unified Inbox
* Privacy-friendly (no tracking whatsoever, only connects to your email provider)
* Automatic background synchronization or push notifications
* Local and server-side search
* OpenPGP email encryption (PGP/MIME)

Install the app <a href="https://f-droid.org/packages/org.sufficientlysecure.keychain">OpenKeychain: Easy PGP</a> to encrypt/decrypt your emails using OpenPGP.

<b>Support</b>

If you're having trouble with K-9 Mail, ask for help in our <a href="https://forum.k9mail.app">support forum</a>.

<b>Want to help?</b>

K-9 Mail is a community developed project. If you're interested in helping to improve the app, please join us!
You can find our bug tracker, source code, and wiki at <a href="https://github.com/thunderbird/thunderbird-android">https://github.com/thunderbird/thunderbird-android</a>.
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

What’s new (21.0)

K-9 Mail version 21.0

Changed:
- Animation setting now allows On, Off, and System Default options
- Modernized 'Fetching mail' account settings screen
- Modernized 'Composition defaults' screen

Fixed:
- Application could crash due to memory exhaustion
- Application could crash when rendering long messages
- Inline images were shown as attachments instead of displaying in message
- Server search results could disappear
- Manage Folders opened the wrong account instead of selected account

Versions

Version Date Size Requires Android Download
21.0 current
f7d99242fe134d58…
 2026-07-23 10 MB API 23
20.1
b57425d03ae8427b…
 2026-07-07 10 MB API 23
20.0
fe507609b221796d…
 2026-06-24 10 MB API 23

Permissions

What the app asks the system for. Android only grants sensitive access after you confirm it.

  • CameraTake photos and videos.
  • Read contactsAccess the address book.
  • NotificationsShow notifications.
  • Run at startupStart automatically after the device is switched on.
  • Sync settingsRead synchronisation settings.
  • Network stateCheck whether and how the device is connected.
  • Internet accessSend and receive data over the internet.
  • VibrationControl the vibration alert.
Show 8 more permissions
  • Prevent sleepingKeep the device from going to sleep.
  • Foreground serviceKeep running in the background, visible in the status bar.
  • FOREGROUND_SERVICE_DATA_SYNC
  • FOREGROUND_SERVICE_SPECIAL_USE
  • Exact alarmsTrigger actions at a precise time.
  • BiometricsUnlock with fingerprint or face.
  • FingerprintUnlock with a fingerprint.
  • k9.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

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