An extension to the mail client of Mozilla / Netscape and Thunderbird which allows users to access the authentication and encryption features provided by the popular GnuPG software
Allows you to store your email in a database in one or more categories, you can build categories by your own and rename them, and you can search email by attributes.
An extension for the Mozilla Mail client that adds a user interface for configuring text and background colors for different quote levels when displaying messages.
An add-on to Mozilla that lets you add a tagline, random or specifically chosen by you, to the end of an email or newsgroup posting, or to the clipboard for pasting into a Web-based email or message board.