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Thunderbird for Android

<a href="https://play.google.com/store/apps/details?id=net.thunderbird.android&referrer=utm_campaign%3Dandroid_metadata%26utm_medium%3Dweb%26utm_source%3Dgithub.com%26utm_content%3Dbadge" target="_blank"><img src="./docs/assets/get-it-on-play.png" alt="Get it on Google Play" height="28"></a> <a href="https://f-droid.org/packages/net.thunderbird.android"><img src="./docs/assets/get-it-on-fdroid.png" alt="Get it on F-Droid" height="28"></a> Latest release Latest beta release

Thunderbird for Android is a powerful, privacy-focused email app. Effortlessly manage multiple email accounts from one app, with a Unified Inbox option for maximum productivity. Built on open-source technology and supported by a dedicated team of developers alongside a global community of volunteers, Thunderbird never treats your private data as a product.

Thunderbird for Android is based on K-9 Mail, which comes with a rich history of success and functionality in open source email.

Download

Thunderbird for Android can be downloaded from a couple of sources:

By using Thunderbird for Android Beta, you have early access to current development and are able to try new features earlier.

Check out the Release Notes to find out what changed in each version of Thunderbird for Android.

Need Help? Found a bug? Have an idea? Want to chat?

If the app is not behaving like it should, or you are not sure if you've encountered a bug:

If you are certain you've identified a bug in Thunderbird for Android and would like to help fix it:

If you have an idea how to improve Thunderbird for Android:

The Thunderbird Community uses Matrix to communicate:

Contributing

We welcome contributions from everyone.

Architecture Decision Records (ADR)

We use Architecture Decision Records to document the architectural decisions made in the development of Thunderbird for Android. You can find them in the docs/architecture/adr directory.

For more information about our ADRs, please see the ADRs README.

We encourage team members and contributors to read through our ADRs to understand the architectural decisions that have shaped this project so far. Feel free to propose new ADRs or suggest modifications to existing ones as needed.

Security

The code in this repository was undergoing an extensive security audit in collaboration with the Open Source Technology Improvement Fund (OSTIF) and 7ASecurity in the first half of 2023. For more details, see our blog post.

You can report a security vulnerability through the respective issues form.

These are the SHA-256 fingerprints for our signing certificates:

You can use the following command to retrieve and verify the certificate before installation:

apksigner verify -v --print-certs <path-to-apk>

K-9 Mail

In June 2022, K-9 Mail joined the Thunderbird family as the foundation for Thunderbird on Android. Since then, we’ve been updating both apps to give users the same solid experience, so it’s normal to notice that K-9 Mail and Thunderbird look and feel nearly identical. They’re built on the same code, and that’s intentional. You'll notice some features are selectively enabled for Thunderbird as opposed to K-9 Mail, usually when they are simply a better fit for Thunderbird (like the import from K-9 functionality).

If you prefer the robot dog and would like to keep K-9 Mail around, you can find it here:

Forking

If you want to use a fork of this project please ensure that you replace the OAuth client setup in the app-k9mail/src/{debug,release}/kotlin/app/k9mail/auth/K9OAuthConfigurationFactory.kt and app-thunderbird/src/{debug,daily,beta,release}/kotlin/net/thunderbird/android/auth/TbOAuthConfigurationFactory.kt with your own OAuth client setup and ensure that the redirectUri is different to the one used in the main project. This is to prevent conflicts with the main app when both are installed on the same device.

License

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.