> For the complete documentation index, see [llms.txt](https://developer-stage.thunderbird.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer-stage.thunderbird.net/readme.md).

# About Thunderbird

Thunderbird is a popular open source email client that has been around for more than 20 years. If you are looking to download it and try it out, please see our main page: <https://www.thunderbird.net>.

While Thunderbird is a company, the Thunderbird community of volunteers is the backbone of the project. If you want to join this vibrant community and see how you can make a difference, continue to the [Getting Started Contributing page](/thunderbird-development/getting-started.md).


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developer-stage.thunderbird.net/readme.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.