96.6K 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/k9mail/k-9
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Updated on
Nov 28, 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.
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
96.6K reviews
Cari Garafalo
November 19, 2022
The warnings for discarding a message upon hitting the back button are disabled by default; drafts are not saved by default. I spent an entire morning drafting a very long email which was discarded without warning while attempting to add an attachment. I've sent messages that bounced and needed to be resent but was unable to because there is no copy of the original in the outbox; while there is an outbox in the list of folders, it doesn't save anything there until you learn the hard way.
3 people found this review helpful
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James Haddad
November 2, 2022
Works well. Great concept. Only two little suggestions. I'd like to be able to swipe left to delete messages in inbox. Also there's a weird bug where if I'm scrolling down the inbox it'll suddenly scroll down a million pages on its own. Also, not sure the search function actually works. Please fix. Otherwise, great.
6 people found this review helpful
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Douglas Fouts
October 15, 2022
So far so much better than Gmail. The design is fine once you get used to it. Takes up minimal storage space (so far) and the app can be moved to an external SD card. Also works better than Gmail when I'm moving between WiFi APs and mediocre cell reception. It even still works when the "dangerously low in space" warning is present, unlike Gmail. It would be nice if it had instant/push syncing though.
5 people found this review helpful
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What's new

- Increased timeout when sending messages because some users have reported problems with sending large attachments
- Allow all URI schemes in HTML links
- Fixed display bug with search in general settings
- When composing messages don't hide Cc and Bcc fields if they contain incomplete email addresses