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Thunderbird Collects Data To:

Improve Performance and Stability For Our Users

Thunderbird collects telemetry data by default to help improve the performance and stability of Thunderbird. There are two types of telemetry data: interaction data and technical data.

1. Apr 28, 2020 Mozilla Thunderbird 52 is a free full-featured and secure email application and chat client that includes an RSS feed reader and newsgroups option. Manage as many email accounts as you want from one convenient location efficiently and with style, while Mozilla Thunderbird filters away the junk mail.
2. Tell Thunderbird what is NOT junk It as just as important to tell the filter which messages are not junk. First, frequently, daily or weekly, check your Junk folder for good messages that have been incorrectly classified as junk by clicking on the Not junk button, or using the upper case J on your keyboard.

Mozilla developers Alexis Beingessner, Tyson Smith, Nika Layzell, and Mats Palmgren reported memory safety bugs present in Thunderbird 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

Interaction data: Thunderbird receives data about your interactions with the application, such as whether calendars and filters are being used, and how many email accounts a user has.

Technical data: Thunderbird also receives basic information about your device and application version, including, 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.

Read the telemetry documentation and learn how to opt-out of this data collection here.

Set-Up and Configure 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 locally on your computer 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).

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.

Review Crash Reports

If Thunderbird crashes, we will ask you to share a report with more detailed information about the crash, but you always have the choice to decline. Thunderbird uses the information in the crash report to diagnose and correct the problem that caused the crash.

Sensitive data: Crash reports include a “dump file” of Thunderbird’s memory contents at the time of the crash, which may contain data that identifies you or is otherwise sensitive to you.

Webpage data: Crash reports include any active URLs at time of crash.

Add-on data: Crash reports include a list of all add-ons that you were using at the time of the crash, and the time since: the start-up of the program, the last crash, and the last install.

Technical data: Crash reports include data on why Thunderbird crashed and the state of device memory and execution during the crash. When Thunderbird sends technical data to us, your IP address is temporarily collected as part of our server logs.

Email address: If you choose, crash reports include your email address.

Read the full documentation here.

Improve Security for Our Users Everywhere

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Technical data for updates: To ensure you have the most up-to-date version of the product, Thunderbird checks for updates by periodically connecting to Thunderbird’s servers. Your application version, language, and device operating system are used to apply the correct updates. Learn more.

Technical data for add-ons blocklist: To help to protect you from any malicious add-ons, Thunderbird periodically checks for blocklisted add-ons. Your Thunderbird version and language, device operating system, and list of installed add-ons are needed to apply and update the add-ons blocklist. Learn more.

Install and Update Add-Ons

You can install add-ons from addons.thunderbird.net or from the Thunderbird Add-ons Manager, which is accessible by clicking on Tools > Add-ons. To keep your installed add-ons up to date—like add-on descriptions, download counts, and ratings—the Thunderbird application periodically connects to our servers to install any updates.

Search queries: If you enter keywords into the search field for the Add-ons Manager, those keywords will be sent to Thunderbird to perform the search.

Interaction data: We receive aggregate data about visits to the Thunderbird website and the Add-ons Manager in Thunderbird, as well as interactions with content on those pages. Read about data practices on Mozilla websites.

Technical data for updates: Thunderbird periodically connects to our server to install updates to add-ons. Your installed add-ons, application version, language, and device operating system are used to apply the correct updates. When Thunderbird sends technical data to us, your IP address is temporarily collected as part of our server logs.

Thunderbird May Disclose Information To:

Mozilla Affiliates: Thunderbird is a project of MZLA Technologies Corporation, a subsidiary of Mozilla Foundation and as such, shares some of the same infrastructure. This means that, from time to time, your data (e.g., crash reports, and technical and interaction data) may be disclosed to Mozilla Corporation and Mozilla Foundation. If so, it will be maintained in accordance with the commitments we make in this Privacy Notice.

DNS servers, Standard Autoconfiguration URIs, and Mozilla's Configuration Database: To simplify the email set-up process, Thunderbird tries to determine the correct settings for your account by contacting Mozilla’s configuration database as well as external servers. These include DNS servers and standard autoconfiguration URIs. During this process, your email domain may be sent to Mozilla's configuration database, and your email address may be disclosed to your network administrators.

Amazon Web Services: Thunderbird uses Amazon Web Services (AWS) to host its servers and as a content delivery network. Your device’s IP address is collected as part of AWS’s server logs.

Email address providers: Thunderbird has partnered with Gandi.net and Mailfence to allow you to create a new email address through Thunderbird. If you choose to use this feature, your email address search terms are sent to Gandi.net and Mailfence to return available addresses. In addition, your country location is also shared to provide the correct prices. You can learn more about Gandi.net’s and Mailfence’s data practices by reading their privacy notices.

To deal with the large amount of unsolicited email ('spam' or 'junk mail') that most people have to cope with, Thunderbird uses an adaptive filter that learns from your actions which messages are legitimate and which are junk.

The Junk filtering does not have regard to the senders email address. Junk mail frequently uses legitimate and known sending addresses which are changed regularly so they are not a good indication on unsolicited commercial email.

Table of Contents

• 1Junk filter options
• 2Training the junk filter

General settings

The filter is enabled by default. You can set system-wide preferences that determine what happens to messages marked as junk. These settings will be used by all your email accounts (although some settings can be overridden in the account settings, as shown below). To access the preferences, click Thunderbird > PreferencesTools > OptionsEdit > Preferences, select the Security panel and then select the Junk tab.

Per account settings

The configuration in the account preferences for each of your email accounts will override similar settings in the preferences described above. Click ToolsEdit > Account Settings and select Junk Settings in the left pane for the account to see these settings. This section includes the ability to enable addressbooks which will be used as a whitelist. If the sender of a message is a contact in an addressbook that has been enabled for whitelist, then that message will not be marked as junk.

Tell Thunderbird what is junk

In order for this filter to be effective, you must train it to recognize the messages that you consider to be junk and the messages that you consider to be not junk. So you will want to mark messages as junk, not delete them.

You can mark messages as junk by clicking in the 'junk' column in the message list:

You can also mark messages as junk in the message pane by clicking the junk icon on the message header toolbar:

You can also use the small case j key to mark messages as junk.

You must mark many messages so the adaptive filter has enough training data, including messages that are NOT junk. (more about that below)

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Tell Thunderbird what is NOT junk

It as just as important to tell the filter which messages are not junk.

First, frequently, daily or weekly, check your Junk folder for good messages that have been incorrectly classified as junk by clicking on the button, or using the upper case J on your keyboard. After the first week you should also check the junk folder for messages that are incorrectly marked as junk, perhaps weekly.

Secondly, you must constantly train the filter by marking a quantity of GOOD messages as not junk - messages in your Inbox AND messages that have been filtered into other folders. You must use the keyboard upper case J, because there is no button - the 'Not Junk' button appears only for messages that have already been classified as junk. Marking several messages per week will be sufficient. You can select many messages and mark them all at the same time. Note - unfortunately nothing in the user interface indicates whether a message has already been marked as 'not junk'.

The adaptive junk filter is not an absolute block against mail from a specific address or specific type of message. If you need a stronger mechanism to stop unwanted messages, then consider Blocking a sender. You can also create a filter to block subject content.