97.6K reviews
Content rating
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About this app

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


* 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 "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.


If you're having trouble with K-9 Mail, ask for help in our support forum at https://forum.k9mail.app

Want to help?

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 https://github.com/thunderbird/thunderbird-android
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Updated on
Oct 12, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Personal info
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

92.5K reviews
Phillip Honstein
December 5, 2023
Customizable, schedulable, sane, private. Handles multiple accounts, makes it easy to switch between accounts, has a unified Inbox to display all messages together, doesn't advertise to me, and displays all messages perfectly. It's just an email client, and a very good one. I didn't start using it until the Thunderbird folks took it over, and I wish I had tried it sooner.
3 people found this review helpful
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AnonE Mouse
September 16, 2023
Like old interface better. This interface is inefficient when switching accounts. With the old interface you could click back several times to get to the accounts screen. With this interface you have to click several different areas of the screen to switch accounts. Super annoying. I'm uninstalling this version and reinstalling the older version.
25 people found this review helpful
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Kelson Vibber
August 19, 2023
No frills, no ads, no tracking. K-9 stays out of your way and lets you read/write/organize your email across multiple accounts plus a unified inbox. Easy to set up with IMAP or Gmail. Works well with both light and dark mode, and you can switch modes per message when needed. Optional 2-column layout works great for tablet screens in landscape mode (and can be set to auto-switch based on screen orientation).
17 people found this review helpful
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What's new

- Fixed settings import/export of identities without a name or description