Premium
Download K-9 Mail 4.009 APK
Target: Android 2.1 (Eclair, API 7)
What's new in K-9 Mail 4.009
- 'Auto-fit messages' setting did not persist
- Edge-to-edge move/copy regressed with 3-button nav
- Swiping message left/right could abort prematurely
- Outlook SMTP failed authentication for some accounts
- Gmail folder prefixes appeared after refreshing folder list
- Quiet time preferences were ignored
- Thunderbird could crash after deleting an account
About K-9 Mail 4.009
K-9 Mail is an open source email client that works with basically every email provider.
Premium
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 at forum.k9mail.app
Want to help?
K-9 Mail is now part of the Thunderbird family and remains 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 github.com/thunderbird/thunderbird-android
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
K-9 Mail 4.009 variants
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:19.2
Uploaded:June 6, 2026 at 9:31AM UTC
File size:10.09 MB
Version:1.004(1004) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 29, 2016 at 1:16AM UTC
File size:1.15 MB
Downloads:29
Version:4.009(14027) for Android 1.5+ (Cupcake, API 3)
Uploaded:June 12, 2012 at 7:50AM UTC
File size:2.25 MB
Downloads:34
Version:2.403(2403) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 9:02AM UTC
File size:747.43 KB
Downloads:10
Version:2.000(2000) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 7:58AM UTC
File size:664.51 KB
Downloads:0
Version:2.401(2401) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 7:22AM UTC
File size:747.44 KB
Downloads:0
Version:2.400(2400) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 6:58AM UTC
File size:732.37 KB
Downloads:0
Version:2.910(2910) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 6:35AM UTC
File size:1.05 MB
Downloads:0
Version:2.600(2600) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 5:37AM UTC
File size:798.35 KB
Downloads:1
Version:2.801(2801) for Android 1.5+ (Cupcake, API 3)
Uploaded:February 8, 2012 at 5:16AM UTC
File size:898.54 KB
Downloads:0
Version:2.803(2803) for Android 1.5+ (Cupcake, API 3)
Uploaded:January 20, 2012 at 12:47AM UTC
File size:900.77 KB
Downloads:4
Version:19.2
Uploaded:June 5, 2026 at 1:37AM UTC
File size:10.56 MB
Downloads:29
Version:19.0
Uploaded:May 29, 2026 at 12:34AM UTC
File size:10.05 MB
Downloads:32
Version:18.0
Uploaded:April 19, 2026 at 4:14PM UTC
File size:9.94 MB
Downloads:116
Version:17.0
Uploaded:March 24, 2026 at 1:32PM UTC
File size:14.01 MB
Downloads:71
Version:16.1
Uploaded:February 28, 2026 at 6:54PM UTC
File size:13.36 MB
Downloads:124
Version:16.0
Uploaded:February 3, 2026 at 6:14PM UTC
File size:13.36 MB
Downloads:88
Version:15.0
Uploaded:January 12, 2026 at 3:40PM UTC
File size:13.29 MB
Downloads:60
Version:14.0
Uploaded:December 20, 2025 at 7:58AM UTC
File size:12.93 MB
Downloads:102
Version:13.0
Uploaded:October 21, 2025 at 8:56PM UTC
File size:12.34 MB
Downloads:135
Version:12.1
Uploaded:September 9, 2025 at 5:44AM UTC
File size:12.20 MB
Downloads:63
