Thunderbird Privacy Notice
Last updated May 9, 2025
The Thunderbird Desktop, Thunderbird for iOS, Thunderbird for Android, and K-9 Mail applications (together, “Thunderbird”) allow users to privately integrate and manage their online communications. K-9 Mail is a variant of Thunderbird for Android. All references to “Thunderbird” or “Thunderbird for Android” apply equally to K-9 Mail.
This Privacy Notice explains what data Thunderbird collects and shares, and why. We also adhere to the Mozilla Privacy Policy for how we receive, handle, and share information.
This privacy notice is for the most recent general release version of Thunderbird distributed by MZLA Technologies Corporation (a subsidiary of Mozilla Foundation). If you obtain Thunderbird elsewhere, or are running an older version, your copy of Thunderbird may contain different privacy characteristics.
Thunderbird Collects Data To:
Improve Performance, Stability, and Functionality For Our Users
Interaction data: Thunderbird receives measurements about how you use Thunderbird and how well it’s working, such as, whether calendars and filters are being used, and how many email accounts a user has.
Technical data: Thunderbird also receives environment data from your device, such as, application version, hardware configuration, device operating system, and language preference. When Thunderbird sends technical data to us, your IP address is temporarily collected as part of our server logs.
We use this information to make better decisions on which features should remain included or need to be changed, identify improvements for new features we implement, and find other ways to improve Thunderbird for all our users. Read the telemetry documentation for Thunderbird Desktop or Thunderbird Mobile to learn how to opt-out of this data collection. Mozilla’s data dictionary contains information on some of the data points collected.
Set-Up, Configure, and Process Your Email
Thunderbird collects your email domain and other technical data to set-up and configure your email account. Other information, like your name, your email messages, and your account’s address book are stored and processed locally on your device and never sent to us. Learn more here.
Email domain: Thunderbird receives your email address domain. Your full email address is never processed or stored on our servers (unless you choose to share it when you send a crash report).
Sending Email: When using Thunderbird to send an email, you can choose recipients from your contacts. You may optionally attach data such as photos, videos, and audio files to your message. This data is exchanged via your email server between you and the recipient of your email and is never shared with us.
Technical data: Thunderbird also receives information about the application’s version and device operating system. When Thunderbird sends technical data to us, your IP address is temporarily collected as part of our server logs.
Set Up and Configure Your Calendar (Desktop Only)
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