K-9 Mail
Full-featured email client
- License
- Apache-2.0
- Package
com.fsck.k9- Category
- Email, Internet
- Latest version
- 24.0 · Oct 18, 2026
- Minimum Android
- Android 6
Screenshots
Description
K-9 Mail is an open source email client that works with basically every email provider.
Features
• 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.
Support
If you're having trouble with K-9 Mail, ask for help in our support forum.
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.
Features
• 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.
Support
If you're having trouble with K-9 Mail, ask for help in our support forum.
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.
All versions
| Version | Released | Minimum Android | Size |
|---|---|---|---|
| 24.0 | Oct 18, 2026 | Android 6 | 10.4 MB |
| 23.1 | Sep 25, 2026 | Android 6 | 10.3 MB |
| 23.0 | Sep 16, 2026 | Android 6 | 10.3 MB |
| 22.0 | Aug 13, 2026 | Android 6 | 10.2 MB |
| 21.1 | Aug 5, 2026 | Android 6 | 10.2 MB |
| 21.0 | Jul 23, 2026 | Android 6 | 10.2 MB |
| 20.1 | Jul 7, 2026 | Android 6 | 10.1 MB |
| 20.0 | Jun 24, 2026 | Android 6 | 10.1 MB |
| 19.2 | Jun 5, 2026 | Android 6 | 10.1 MB |
| 19.1 | Jun 4, 2026 | Android 6 | 9.6 MB |
| 19.0 | May 28, 2026 | Android 6 | 9.6 MB |
| 18.0 | Apr 16, 2026 | Android 6 | 9.5 MB |
| 17.0 | Mar 19, 2026 | Android 6 | 13.4 MB |
| 16.1 | Feb 10, 2026 | Android 5.0 | 12.8 MB |
| 16.0 | Feb 4, 2026 | Android 5.0 | 12.8 MB |
| 15.0 | Jan 6, 2026 | Android 5.0 | 12.7 MB |
| 14.0 | Nov 22, 2025 | Android 5.0 | 12.3 MB |
| 13.0 | Oct 30, 2025 | Android 5.0 | 11.8 MB |
| 12.1 | Sep 8, 2025 | Android 5.0 | 11.6 MB |
| 11.1 | Aug 27, 2025 | Android 5.0 | 11.4 MB |
| 11.0 | Jul 24, 2025 | Android 5.0 | 11.4 MB |
| 10.1 | Jul 1, 2025 | Android 5.0 | 10.2 MB |
| 10.0 | May 18, 2025 | Android 5.0 | 10.2 MB |
| 9.0 | Mar 23, 2025 | Android 5.0 | 10.1 MB |
| 9.0b3 | Dec 17, 2024 | Android 5.0 | 10.1 MB |
| 8.2 | Dec 17, 2024 | Android 5.0 | 10.1 MB |
| 9.0b2 | Dec 9, 2024 | Android 5.0 | 10.1 MB |
| 8.1 | Nov 15, 2024 | Android 5.0 | 10.1 MB |
| 8.0 | Nov 5, 2024 | Android 5.0 | 10.1 MB |
| 8.0b5 | Nov 2, 2024 | Android 5.0 | 10.1 MB |
| 8.0b4 | Oct 25, 2024 | Android 5.0 | 10.2 MB |
| 8.0b3 | Oct 20, 2024 | Android 5.0 | 10.7 MB |
| 8.0b2 | Oct 17, 2024 | Android 5.0 | 10.7 MB |
| 6.904 | Jul 1, 2024 | Android 5.0 | 10 MB |
| 6.903 | Jun 28, 2024 | Android 5.0 | 10 MB |
| 6.901 | May 20, 2024 | Android 5.0 | 9.8 MB |
| 6.804 | Jun 15, 2024 | Android 5.0 | 9.7 MB |
| 6.803 | May 14, 2024 | Android 5.0 | 9.7 MB |
| 6.802 | Apr 9, 2024 | Android 5.0 | 9.7 MB |
| 6.801 | Mar 16, 2024 | Android 5.0 | 9.6 MB |
| 6.800 | Mar 9, 2024 | Android 5.0 | 9.6 MB |
| 6.717 | Feb 19, 2024 | Android 5.0 | 9.6 MB |
| 6.716 | Feb 15, 2024 | Android 5.0 | 9.6 MB |
| 6.715 | Feb 6, 2024 | Android 5.0 | 9.7 MB |
| 6.714 | Jan 7, 2024 | Android 5.0 | 9.6 MB |
| 6.713 | Dec 6, 2023 | Android 5.0 | 9.5 MB |
| 6.712 | Dec 3, 2023 | Android 5.0 | 9.5 MB |
| 6.711 | Oct 8, 2023 | Android 5.0 | 9.6 MB |
| 6.710 | Aug 26, 2023 | Android 5.0 | 9.6 MB |
| 6.708 | Aug 14, 2023 | Android 5.0 | 9.6 MB |
| 6.707 | Jun 21, 2023 | Android 5.0 | 7.8 MB |
| 6.706 | Jun 18, 2023 | Android 5.0 | 7.8 MB |
| 6.705 | Jun 14, 2023 | Android 5.0 | 7.8 MB |
| 6.704 | May 26, 2023 | Android 5.0 | 7.7 MB |
| 6.702 | May 5, 2023 | Android 5.0 | 7.8 MB |
| 6.700 | Apr 27, 2023 | Android 5.0 | 8 MB |
| 6.603 | Oct 15, 2023 | Android 5.0 | 7.9 MB |
| 6.602 | May 15, 2023 | Android 5.0 | 7.9 MB |
| 6.601 | Apr 20, 2023 | Android 5.0 | 7.9 MB |
| 6.600 | Apr 15, 2023 | Android 5.0 | 7.9 MB |
| 6.511 | Apr 6, 2023 | Android 5.0 | 7.9 MB |
| 6.510 | Apr 1, 2023 | Android 5.0 | 7.9 MB |
| 6.509 | Mar 5, 2023 | Android 5.0 | 7.9 MB |
| 6.508 | Feb 18, 2023 | Android 5.0 | 7.9 MB |
| 6.507 | Feb 16, 2023 | Android 5.0 | 7.9 MB |
| 6.506 | Feb 6, 2023 | Android 5.0 | 7.9 MB |
| 6.504 | Feb 3, 2023 | Android 5.0 | 7.9 MB |
| 6.503 | Jan 21, 2023 | Android 5.0 | 7.9 MB |
| 6.502 | Jan 17, 2023 | Android 5.0 | 7.6 MB |
| 6.501 | Jan 11, 2023 | Android 5.0 | 7.6 MB |
| 6.400 | Nov 29, 2022 | Android 5.0 | 7.6 MB |
| 6.312 | Nov 16, 2022 | Android 5.0 | 7.6 MB |
| 6.311 | Nov 5, 2022 | Android 5.0 | 7.6 MB |
| 6.310 | Oct 26, 2022 | Android 5.0 | 7.6 MB |
| 6.309 | Oct 15, 2022 | Android 5.0 | 7.6 MB |
| 6.308 | Oct 9, 2022 | Android 5.0 | 7.5 MB |
| 6.307 | Sep 29, 2022 | Android 5.0 | 7.5 MB |
| 6.306 | Sep 29, 2022 | Android 5.0 | 7.6 MB |
| 6.305 | Sep 19, 2022 | Android 5.0 | 7.8 MB |
| 6.303 | Sep 10, 2022 | Android 5.0 | 7.8 MB |
| 6.302 | Sep 9, 2022 | Android 5.0 | 7.8 MB |
| 6.301 | Aug 11, 2022 | Android 5.0 | 7.8 MB |
| 6.202 | Jul 28, 2022 | Android 5.0 | 7.7 MB |
| 6.201 | Jul 19, 2022 | Android 5.0 | 7.7 MB |
| 6.200 | Jul 10, 2022 | Android 5.0 | 7.7 MB |
| 6.101 | Jul 9, 2022 | Android 5.0 | 7.7 MB |
| 6.100 | Jun 20, 2022 | Android 5.0 | 7.7 MB |
| 6.000 | Apr 20, 2022 | Android 5.0 | 7.4 MB |
| 5.916 | Apr 14, 2022 | Android 5.0 | 7.4 MB |
| 5.915 | Apr 11, 2022 | Android 5.0 | 7.4 MB |
| 5.914 | Mar 27, 2022 | Android 5.0 | 7.4 MB |
| 5.913 | Mar 14, 2022 | Android 5.0 | 7.4 MB |
| 5.912 | Feb 25, 2022 | Android 5.0 | 7.1 MB |
| 5.911 | Feb 16, 2022 | Android 5.0 | 7.1 MB |
| 5.910 | Jan 28, 2022 | Android 5.0 | 7.1 MB |
| 5.909 | Jan 16, 2022 | Android 5.0 | 7.1 MB |
| 5.908 | Jan 8, 2022 | Android 5.0 | 7.1 MB |
| 5.907 | Dec 30, 2021 | Android 5.0 | 7.1 MB |
| 5.906 | Dec 11, 2021 | Android 5.0 | 7.1 MB |
| 5.905 | Dec 2, 2021 | Android 5.0 | 7.2 MB |
| 5.904 | Oct 9, 2021 | Android 5.0 | 7.2 MB |
| 5.903 | Oct 1, 2021 | Android 5.0 | 7.2 MB |
| 5.902 | Sep 24, 2021 | Android 5.0 | 7.3 MB |
| 5.901 | Sep 22, 2021 | Android 5.0 | 7.3 MB |
| 5.900 | Sep 17, 2021 | Android 5.0 | 7.3 MB |
| 5.807 | Feb 3, 2022 | Android 5.0 | 7.1 MB |
| 5.806 | Sep 2, 2021 | Android 5.0 | 7.1 MB |
| 5.805 | Aug 29, 2021 | Android 5.0 | 7.1 MB |
| 5.804 | Aug 21, 2021 | Android 5.0 | 7.1 MB |
| 5.803 | Aug 21, 2021 | Android 5.0 | 7.1 MB |
| 5.802 | Aug 10, 2021 | Android 5.0 | 7.1 MB |
| 5.801 | Aug 5, 2021 | Android 5.0 | 7.1 MB |
| 5.800 | Jul 31, 2021 | Android 5.0 | 7.1 MB |
| 5.740 | Jul 22, 2021 | Android 5.0 | 7.1 MB |
| 5.739 | Jul 15, 2021 | Android 5.0 | 7.1 MB |
| 5.738 | Jul 12, 2021 | Android 5.0 | 7.1 MB |
| 5.737 | Jul 2, 2021 | Android 5.0 | 7 MB |
| 5.734 | May 5, 2021 | Android 5.0 | 7 MB |
| 5.733 | Mar 26, 2021 | Android 5.0 | 6.9 MB |
| 5.732 | Mar 8, 2021 | Android 5.0 | 6.9 MB |
| 5.731 | Feb 26, 2021 | Android 5.0 | 6.7 MB |
| 5.730 | Feb 26, 2021 | Android 5.0 | 6.6 MB |
| 5.729 | Feb 17, 2021 | Android 5.0 | 6.5 MB |
| 5.728 | Feb 15, 2021 | Android 5.0 | 6.5 MB |
| 5.727 | Jan 31, 2021 | Android 5.0 | 6.5 MB |
| 5.726 | Jan 9, 2021 | Android 5.0 | 6.6 MB |
| 5.724 | Nov 3, 2020 | Android 5.0 | 6.7 MB |
| 5.723 | Nov 1, 2020 | Android 5.0 | 6.7 MB |
| 5.722 | Oct 24, 2020 | Android 5.0 | 6.7 MB |
| 5.721 | Oct 10, 2020 | Android 5.0 | 6.7 MB |
| 5.718 | Sep 13, 2020 | Android 5.0 | 7.8 MB |
| 5.717 | Jun 20, 2020 | Android 5.0 | 7.8 MB |
| 5.716 | Jun 10, 2020 | Android 5.0 | 7.7 MB |
| 5.715 | Jun 2, 2020 | Android 5.0 | 7.7 MB |
| 5.714 | May 17, 2020 | Android 5.0 | 8 MB |
| 5.713 | May 11, 2020 | Android 5.0 | 8.3 MB |
| 5.712 | May 11, 2020 | Android 5.0 | 8.3 MB |
| 5.710 | May 6, 2020 | Android 5.0 | 8.2 MB |
| 5.709 | Apr 21, 2020 | Android 5.0 | 8.2 MB |
| 5.708 | Apr 6, 2020 | Android 5.0 | 8.2 MB |
| 5.707 | Mar 16, 2020 | Android 5.0 | 8.2 MB |
| 5.706 | Mar 16, 2020 | Android 5.0 | 8.2 MB |
| 5.600 | Sep 11, 2018 | Android API 15 | 4.6 MB |
| 5.403 | Jan 21, 2018 | Android API 15 | 5.1 MB |
| 5.402 | Jan 5, 2018 | Android API 15 | 5.1 MB |
| 5.401 | Jan 5, 2018 | Android API 15 | 5.1 MB |
| 5.400 | Jan 5, 2018 | Android API 15 | 5.1 MB |
| 5.208 | Aug 30, 2017 | Android API 15 | 4.6 MB |
| 5.207 | Apr 17, 2017 | Android API 15 | 4.6 MB |
| 5.206 | Mar 17, 2017 | Android API 15 | 4.6 MB |
| 5.205 | Feb 26, 2017 | Android API 15 | 4.6 MB |
| 5.203 | Jan 20, 2017 | Android API 15 | 4.5 MB |
| 5.202 | Jan 6, 2017 | Android API 15 | 4.5 MB |
| 5.201 | Jan 2, 2017 | Android API 15 | 4.5 MB |
| 5.200 | Dec 27, 2016 | Android API 15 | 4.5 MB |
| 5.010 | Apr 15, 2016 | Android API 15 | 3.6 MB |
| 5.008 | Feb 10, 2016 | Android API 15 | 3.6 MB |
| 5.007 | Nov 29, 2015 | Android API 15 | 3.6 MB |
| 5.006 | Jun 10, 2015 | Android API 15 | 3.6 MB |
| 5.005 | Apr 30, 2015 | Android API 15 | 3.6 MB |
| 5.004 | Mar 15, 2015 | Android API 15 | 3.6 MB |
| 5.002 | Dec 20, 2014 | Android API 15 | 3.6 MB |
| 5.001 | Oct 12, 2014 | Android API 15 | 3.6 MB |
| 5.000 | Sep 27, 2014 | Android API 15 | 3.6 MB |
| 4.804 | Jun 28, 2014 | Android API 8 | 3.3 MB |
| 4.803 | Jan 29, 2014 | Android API 8 | 3.3 MB |
| 4.802 | Jan 24, 2014 | Android API 8 | 3.3 MB |
| 4.409 | Sep 12, 2013 | Android API 8 | 3.1 MB |
| 4.201 | Sep 12, 2013 | Android API 7 | 2.5 MB |
How to install an older version of an Android app · How to install an APK file on Android
From the developer (GitHub)
APK files published by the developer on GitHub. They are signed by the developer and may not install over the other builds on this page (different signature). Links open github.com.
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