Privacy and security

Avoid and report Mozilla tech support scams

Mozilla does not provide telephone support and does not charge for software downloads, upgrades or technical help. Learn more.

Remote Content in Messages

This page explains the privacy implications of allowing remote content like images to be displayed in email messages.

Microsoft OAuth Authentication and Thunderbird in 2024

Changes to OAuth authentication for Microsoft 365 (formerly Office 365; often abbreviated as “o365”) business and academic hosted email accounts and services.

Password Manager - Remember, delete and change passwords in Thunderbird

The Thunderbird Password Manager securely stores your username and passwords. Learn how to save, view, delete and edit your passwords.

Introduction to End-to-end encryption in Thunderbird

This article explains what end-to-end encryption is and how to use it to protect the contents of your email in Thunderbird.

Automatic Conversion of Google mail accounts to OAuth 2.0 Authentication

Thunderbird 91.8.0, released 5th April 2022, converts Gmail accounts to OAuth 2.0 in compliance with Google's schedule for requiring this login method.

OpenPGP in Thunderbird - HOWTO and FAQ

This article answers common questions about OpenPGP support in Thunderbird, as implemented in End-To-End Encryption (e2ee), and how it differs from Enigmail.

Instructions for obtaining a personal S/MIME certificate by creating a CSR

Description of the manual process of obtaining an S/MIME certificate for email security, using a Certificate Signing Request (CSR) generated by Thunderbird.

Protect your Thunderbird passwords with a Primary Password

Make Thunderbird require you to enter a primary password in order to view or use passwords you've told Thunderbird to remember.

Thunderbird Telemetry

Thunderbird collects telemetry data by default. We collect this data to help improve the performance and stability of Thunderbird. Learn more.

Primary Password is replacing Master Password in Thunderbird

Primary Password is replacing Master Password. Learn more about why we are making this change.

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Certificates

Why does Thunderbird warn me that my server don't use encryption?

Digitally Signing and Encrypting Messages

This tutorial explains how to set up Thunderbird to digitally sign, encrypt and decrypt messages in order to make them secure.

How Thunderbird’s scam detection works?

How can I digitally sign and encrypt emails?

OpenPGP Recipient Alias Configuration

How to set up and use the OpenPGP recipient Alias feature in Thunderbird.

Unsafe properties of OpenPGP keys might be ignored

If Thunderbird unexpectedly reports that an OpenPGP key is expired, or isn't showing some expected properties, the key might have unsafe properties.