Thunderbird Beta for Testers (f-droid version)

Download Thunderbird Beta for Testers (f-droid version) APK

com.fsck.k9 · by Mozilla Thunderbird

Communication Mozilla Thunderbird
Latest Version: 10.1 • Updated: Jun 02, 2026
Download Thunderbird Beta for Testers (f-droid version) APK
v10.1 · APK

Screenshots

Thunderbird Beta for Testers (f-droid version) screenshot 1
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Thunderbird Beta for Testers (f-droid version) screenshot 9

About Thunderbird Beta for Testers (f-droid version)

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 . 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. License: Apache License 2.0 Website Issue Tracker Translation Source Code Changelog Build Metadata Reproducibility Status

All Thunderbird Beta for Testers (f-droid version) APK versions

10.1
May 28, 2026
1 variant
11.1
May 28, 2026
1 variant
11.1
May 26, 2026
1 variant
12.0
May 18, 2026
1 variant
12.1
May 17, 2026
1 variant
12.1
May 13, 2026
1 variant
13.0
Feb 24, 2026
1 variant
13.0
Jan 27, 2026
1 variant
0.90
Jan 07, 2026
1 variant
0.4
Jan 07, 2026
1 variant
1.004
Jan 07, 2026
1 variant
Thunderbird Beta for Testers (f-droid version)
Dec 16, 2025
1 variant

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Frequently Asked Questions

Yes. Every Thunderbird Beta for Testers (f-droid version) APK on APK.now is automatically scanned and the cryptographic signature is verified against the original publisher's certificate (Mozilla Thunderbird). Files that fail verification are removed before they ever reach the catalog.

Enable 'Install from unknown sources' for your browser (or the file manager you use to open the APK) under Settings → Apps → Special access. Tap the downloaded Thunderbird Beta for Testers (f-droid version) APK, confirm the prompts, and Android installs it just like any app from the Play Store.

The latest Thunderbird Beta for Testers (f-droid version) version available on APK.now is 10.1. We track new releases from Mozilla Thunderbird continuously and add them to the catalog as soon as they pass verification.

Yes — every Thunderbird Beta for Testers (f-droid version) APK and every version on APK.now is free to download. We never gate downloads behind sign-up, surveys, or paywalls.

APK.now keeps a full archive of every Thunderbird Beta for Testers (f-droid version) release, including older versions that the Play Store has already replaced. The APKs work on devices without Google Play Services (Huawei, GrapheneOS, Amazon Fire) and are signature-verified so you can be confident the file is genuine.