# Mozilla Thunderbird

A free, open-source, donation-funded email client from the Mozilla family — unified inbox, calendar and contacts, and no ads or AI training on your mail.

- **Category:** [Utilities](https://notchlist.vercel.app/category/utilities/)
- **Price:** Free forever (donation-supported)
- **Open source:** yes
- **Official site:** https://www.thunderbird.net/en-US/
- **Available via:** Direct, Homebrew
- **Requirements:** macOS, Windows, and Linux; a companion Android app is also available.
- **Maker:** The Thunderbird Project (MZLA Technologies Corporation, a Mozilla subsidiary)

## Kitsmith's take

The privacy-first default for people who’d rather not hand an inbox to a company whose business model depends on reading it. Thunderbird explicitly states it doesn’t collect personal data, sell inbox ads, or train AI on user messages, and funds development through donations rather than a paid tier. It’s built and maintained by a dedicated staff under MZLA, a for-profit Mozilla subsidiary structured specifically to sustain the free, open-source project long-term — not a side project. Cross-platform (Mac, Windows, Linux), with a newer mobile app for Android.

## Features

- **Unified inbox & calendar:** Manages multiple accounts, calendars, and contacts together or separately in one app.
- **No data collection or ad-targeting:** The project states it doesn’t collect personal data, sell inbox ads, or train AI on private messages.
- **Deep customization:** Extensible with add-ons and tagging, built for people who want to configure their client rather than accept defaults.
- **Cross-platform, including mobile:** Runs on Mac, Windows, and Linux, with a newer Thunderbird for Android app.

## FAQ

**Is Thunderbird really free?**

Yes — free forever, funded by user donations rather than ads, data sales, or a paid tier.

**Who develops Thunderbird?**

The Thunderbird Project, operating as MZLA, a for-profit subsidiary structured to sustain the free open-source project within the Mozilla family.


---

Hand-verified listing on Kitsmith: https://notchlist.vercel.app/apps/mozilla-thunderbird/