95.9K 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/k9mail/k-9
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Updated on
Apr 18, 2022

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

Ratings and reviews

95.9K reviews
Andrew Bennett
April 20, 2022
Free, open source. It won't spy on you or track you. It may not be the easiest to set up, but given time to get it where you want it, it's pretty solid. Great IMAP implementation. Some mail services will need an app password to integrate with K-9. I have a dozen accounts configured - with the unified inbox, and been a happy user for over 10 years. And still my favorite to pull all my past emails together into a single view. Works with Gmail, Hotmail and Yahoo app passwords very well.
56 people found this review helpful
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Theresa Arzadon-Labajo
February 22, 2022
I have been using K9 for almost 10 years and loved it. But now the recent updates have made it almost unusable. Fetching takes forever. I can login to webmail faster, so what's the point. Also search is abysmal. I don't know what field the search uses but it doesn't find words that are clearly there. Then when I search the server, it only returns the subject line, no content. I have to wait for content to come in, then all of a sudden all the items disappear and i have to search again.
72 people found this review helpful
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Bob Mertz
January 13, 2022
I tried... I can't. This used to be the best email client but this redesign is just terrible for multiple accounts. I've stuck with it for over a month and I've gotten used to a lot but can't deal without the "home screen" that shows my accounts. Besides UI, if an email fails to send on the first try it basically never will send and telling it to "send messages" does nothing" and to top that off there is no status so you don't know if it's even trying. I want the old K9 back!
75 people found this review helpful
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What's new

- Added support for setting the notification vibration pattern on Android 8+
- Added support for setting a custom notification light color on Android 8+
- Added a setting to configure the notification sound on Android 8+
- A lot of other improvements and bug fixes related to notifications
- Added support for entering Reply-To addresses when composing a message
- Optionally show starred message count in side drawer
- Numerous other bug fixes and improvements (see in-app change log)