This page explains the privacy implications of allowing remote content like images to be displayed in email messages.
The Thunderbird Password Manager securely stores your username and passwords. Learn how to save, view, delete and edit your passwords.
Make Thunderbird require you to enter a master password in order to view or use passwords you've told Thunderbird to remember.
This article explains what end-to-end encryption is and how to use it to protect the contents of your email in Thunderbird.
This article answers common questions about OpenPGP support in Thunderbird, as implemented in End-To-End Encryption (e2ee), and how it differs from Enigmail.
This tutorial explains how to set up Thunderbird to digitally sign, encrypt and decrypt messages in order to make them secure.