98.4K 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
Jun 10, 2024

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.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

93.3K reviews
Michael Covello
May 16, 2024
A really nice user experience. Snappy, fast. Messages stream-in/load quickly. Easy integration & account imports. Moving emails to folders has fuzzy text search!! (I have a lot of folders). Tons of setting & per-account customization options (very flexible). End-to-end encryption support. Wow, glad I tried this!
16 people found this review helpful
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Mozilla Thunderbird
June 13, 2024
We're glad you tried it, too! Thanks for taking the time to leave your review, Michael.
Paul McClure
April 20, 2024
It's a pleasant UI and it doesn't automatically start downloading every email you've ever had when you first sign in with email account (Thunderbird Desktop Client does that and I'm still trying find a solution to get it to delete the emails on my local machine, but still have original copies of the emails on the server.) I want Thunderbird to set the account like this app does, by default.
20 people found this review helpful
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Craig Davis
March 27, 2024
I tried K9 years ago and found it a bit ugly, but with the death of Nine, I decided to give it another shot. The customization options and setup have improved significantly, and I was excited to learn about the impending transition to Thunderbird (have used it on desktop for years). If I could add any feature, it would be transparency options on widgets. Thank you K9 and Mozilla for finally bringing Thunderbird to Android!
38 people found this review helpful
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What's new

- Ask for permission to schedule alarms before allowing to enable Push on Android 12+
- Updated translations