96.4K 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/k9mail/k-9
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Updated on
Aug 2, 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
96.4K reviews
Dennis Lathem
May 23, 2022
I DO NOT like the new version I installed on July 26th 2021. It is harder to navigate. I liked it just the way it was. I need polling sooner than 15 minutes for 2 of my 4 accounts. I takes a LOT longer to do everything with the new version. If you ask me a step backwards. However, I understand the changes Google requires and some of the changes might be driven by that. I was so excited when I saw an update. I wish I had waited. Thank you to the developers of this app for their efforts. ******** I have increased my rating with the latest update to the app. It is easier to work with using 4 email accounts. I DO WISH they would enable a shorter email check interval. I have one email that I am often engaged in serious exchanges and having faster fetch would be a big help.
101 people found this review helpful
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Bob Mertz
June 10, 2022
I still miss the classic interface (especially the multi account home screen) but I've forced myself to get more used to it AND THEN it gets worse. The last update makes everything unbearably slow. Just going from message to message can take 5-10 seconds. I've been using the new interface for 6+ months and have learned to deal with (not like) it but this sudden slowness in the very last update is really pushing me away.
108 people found this review helpful
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Terry W
June 16, 2022
I was surprised this app did not have a much higher rating after recently downloading and using it. It is one of the best email programs I have ever used. It was easy to add my different email accounts. It supports aliases on outlook, and and lets you add folders to the unified folder. Unlike my last app it quickly connects to my various accounts, and also handles outgoing emails much faster. Good documentation is available. Overall an excellent app. Don't want to wait 15min, manually refresh.
30 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