Premium
Download Thunderbird Beta for Testers (f-droid version) 18.0 APK
Supports installation on external storage.
Target: Android 15 (API 35)
nodpi
What's new in Thunderbird Beta for Testers (f-droid version) 18.0
New:
- PNG avatars
- Setting to display ISO date/time in message list
- Fixed-width font for composing
Changed:
- Attachment summary moved to header
Fixed:
- "Delete (from notification)" setting did not retain state
- Find folder search hint text was cut off
- User not notified if offline when sending message
- CC/BCC fields were not expanded by default for Reply All
- Crash occurred when retrieving images
- Deleted messages could remain visible in message list
About Thunderbird Beta for Testers (f-droid version) 18.0
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) 18.0 variants
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:18.0
Uploaded:April 19, 2026 at 4:14PM UTC
File size:9.94 MB
Downloads:116
Version:19.2
Uploaded:June 5, 2026 at 1:37AM UTC
File size:10.56 MB
Version:19.2(39038) for Android 6.0+ (Marshmallow, API 23)
Uploaded:June 6, 2026 at 9:31AM UTC
File size:10.09 MB
Downloads:9
Version:19.1(39037) for Android 6.0+ (Marshmallow, API 23)
Uploaded:June 5, 2026 at 2:19PM UTC
File size:9.57 MB
Downloads:2
Version:19.0(39036) for Android 6.0+ (Marshmallow, API 23)
Uploaded:May 29, 2026 at 3:19PM UTC
File size:9.57 MB
Downloads:6
Version:18.0(39035) for Android 6.0+ (Marshmallow, API 23)
Uploaded:April 17, 2026 at 5:46PM UTC
File size:9.48 MB
Downloads:6
Version:17.0(39034) for Android 6.0+ (Marshmallow, API 23)
Uploaded:March 20, 2026 at 8:52PM UTC
File size:13.38 MB
Downloads:10
Version:19.2
Uploaded:June 6, 2026 at 9:31AM UTC
File size:10.09 MB
Downloads:9
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
