Premium
What's new in Thunderbird Beta for Testers (f-droid version) 12.0
- Add support for avatars in account settings
- Enable edge-to-edge support
- Long words and links in email messages did not wrap properly
- Swipe right to archive failed if archive folder did not exist
- Gmail prefixes were shown in the folder structure
- Unicode folder names were malformed when using server supporting UTF-8
About Thunderbird Beta for Testers (f-droid version) 12.0
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.
Download Thunderbird Beta for Testers (f-droid version) 12.0
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:21.0
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Uploaded:March 3, 2026 at 10:56PM UTC
File size:12.76 MB
Downloads:14
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Uploaded:February 7, 2026 at 10:32AM UTC
File size:12.76 MB
Downloads:18
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