Premium
Download Thunderbird Beta for Testers (f-droid version) 16.1 APK
Supports installation on external storage.
Target: Android 15 (API 35)
nodpi
What's new in Thunderbird Beta for Testers (f-droid version) 16.1
New:
- Default folder expansion behavior can be controlled by setting
- Preferred content type can be switched between text/plain and text/html
Fixed:
- Switching folders required too many clicks
- Fix edge-to-edge issues
- Application crashed at startup
- Application crashed on Pixel 10 Pro when returning to message list
- OAuth SMTP authentication failed with some Microsoft servers
Unresolved:
- Deleted/read messages in unified inbox may not update until refresh
About Thunderbird Beta for Testers (f-droid version) 16.1
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.
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.
Thunderbird Beta for Testers (f-droid version) 16.1 variants
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:16.1
Uploaded:February 28, 2026 at 6:54PM UTC
File size:13.36 MB
Downloads:124
Version:19.2
Uploaded:June 5, 2026 at 1:37AM UTC
File size:10.56 MB
Version:16.1(39033) for Android 5.0+ (Lollipop, API 21)
Uploaded:March 3, 2026 at 10:56PM UTC
File size:12.76 MB
Downloads:12
Version:16.0(39032) for Android 5.0+ (Lollipop, API 21)
Uploaded:February 7, 2026 at 10:32AM UTC
File size:12.76 MB
Downloads:16
Version:15.0(39031) for Android 5.0+ (Lollipop, API 21)
Uploaded:January 16, 2026 at 4:27PM UTC
File size:12.69 MB
Downloads:12
Version:14.0(39030) for Android 5.0+ (Lollipop, API 21)
Uploaded:November 24, 2025 at 3:48AM UTC
File size:12.33 MB
Downloads:17
Version:13.0(39029) for Android 5.0+ (Lollipop, API 21)
Uploaded:November 2, 2025 at 8:10AM UTC
File size:11.77 MB
Downloads:12
Version:12.1(39028) for Android 5.0+ (Lollipop, API 21)
Uploaded:September 8, 2025 at 11:25AM UTC
File size:11.63 MB
Downloads:16
Version:12.0(39027) for Android 5.0+ (Lollipop, API 21)
Uploaded:September 6, 2025 at 8:51AM UTC
File size:11.63 MB
Downloads:13
Version:11.1(39026) for Android 5.0+ (Lollipop, API 21)
Uploaded:August 28, 2025 at 12:40AM UTC
File size:11.43 MB
Downloads:21
Version:11.0(39025) for Android 5.0+ (Lollipop, API 21)
Uploaded:July 25, 2025 at 2:14PM UTC
File size:11.43 MB
Downloads:23
Version:10.1(39024) for Android 5.0+ (Lollipop, API 21)
Uploaded:July 1, 2025 at 3:01PM UTC
File size:10.22 MB
Downloads:23
Version:19.2
Uploaded:June 6, 2026 at 9:31AM UTC
File size:10.09 MB
Downloads:8
Version:19.1
Uploaded:June 5, 2026 at 2:19PM UTC
File size:9.57 MB
Downloads:2
Version:19.0
Uploaded:May 29, 2026 at 3:19PM UTC
File size:9.57 MB
Downloads:6
Version:18.0
Uploaded:April 17, 2026 at 5:46PM UTC
File size:9.48 MB
Downloads:6
Version:17.0
Uploaded:March 20, 2026 at 8:52PM UTC
File size:13.38 MB
Downloads:10
Version:16.1
Uploaded:March 3, 2026 at 10:56PM UTC
File size:12.76 MB
Downloads:12
Version:16.0
Uploaded:February 7, 2026 at 10:32AM UTC
File size:12.76 MB
Downloads:16
Version:15.0
Uploaded:January 16, 2026 at 4:27PM UTC
File size:12.69 MB
Downloads:12
Version:14.0
Uploaded:November 24, 2025 at 3:48AM UTC
File size:12.33 MB
Downloads:17
Version:13.0
Uploaded:November 2, 2025 at 8:10AM UTC
File size:11.77 MB
Downloads:12
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