Download Thunderbird Beta for Testers (f-droid version) APK 0.4 Universal · Android +
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This is the universal build of Thunderbird Beta for Testers (f-droid version) 0.4. It contains native libraries for every CPU architecture (arm64-v8a, armeabi-v7a, x86, x86_64), so it installs on any Android device. The trade-off is size — it's larger than per-architecture variants. Pick this one if you're unsure which CPU your phone has, or if you plan to share the APK with multiple devices.
File size: 0.4 MB • Version code: 4 • Framework: Native (Java/Kotlin) • Permissions: 7
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File Information
| Package Name | com.fsck.k9 |
|---|---|
| Version Name | 0.4 |
| Version Code | 4 |
| Architecture | Universal |
| Min Android Version | Android None (API None) |
| Main Activity | com.fsck.k9.activity.Welcome |
| Framework | Native (Java/Kotlin) |
| File Size | 428.22 KB |
| Signature (SHA1) | 0F1F3252CBA1C94DDD6186DAD5A035E96C6EE5E3 |
| File Hash (SHA256) | 170cdc337e9b85d3cb5f0473f6376eb432b9568a64bf8bf2b7a11fdcca97b155 |
What's New
- Sync logging limited to 24 hours
- Client certificate not displayed in SMTP settings
- "Enable debug logging" did not provide verbose logging
- Scrolling short email could trigger left/right swipe
- Landscape scrolling only worked in center of some screens
- IMAP folder operations broken with prefixes
- HTML/table rendering display broken
- Application crashed opening placeholder folder
- Client certificate not displayed in SMTP settings
- "Enable debug logging" did not provide verbose logging
- Scrolling short email could trigger left/right swipe
- Landscape scrolling only worked in center of some screens
- IMAP folder operations broken with prefixes
- HTML/table rendering display broken
- Application crashed opening placeholder folder
App 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 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.
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.
Download Thunderbird Beta for Testers (f-droid version) APK
Fast, free and safe download.
APK Permissions 7
- android.permission.ACCESS_NETWORK_STATE
- android.permission.INTERNET
- android.permission.READ_CONTACTS
- android.permission.READ_OWNER_DATA
- android.permission.RECEIVE_BOOT_COMPLETED
- android.permission.VIBRATE
- com.fsck.k9.permission.READ_ATTACHMENT
APK Verified
The cryptographic signature guarantees that the file is safe to install and was not tampered with in any way.
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Frequently Asked Questions about Thunderbird Beta for Testers (f-droid version) APK
This is the universal variant — a single APK that contains native libraries for every CPU architecture. It installs on any Android device but is larger than per-architecture variants.
Yes — the APK's signature has been cryptographically verified against the publisher's signing key. The SHA-256 hash is shown in the File Information panel so you can independently confirm the file matches the original release.
Android the listed (API level None) or newer. Older devices will refuse the install.
Install a free app like 'CPU-Z' or 'Droid Hardware Info' from the Play Store and look at the ABI / Instruction Set row. Most phones made after 2017 are arm64-v8a; if in doubt, download the universal variant.
All variants are functionally identical — same features, same version. They differ only in which CPU architectures the native code is compiled for, and (sometimes) which screen densities the included graphics target. Pick the one that matches your device for the smallest install size, or pick 'Universal' if you're unsure.