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.
This tutorial explains how to set up Thunderbird to digitally sign, encrypt and decrypt messages in order to make them secure.
Make Thunderbird require you to enter a master password in order to view or use passwords you've told Thunderbird to remember.