I guess using tribe as a place to store my email tool extensions, and in case someone else uses thunderbird (v1.5) you might find these useful/fun:
• abcTajpu
        a` b\ c^ ---> à β ĉ (lingvo.org/abctajpu)
• AboutConfig
        about:config
• ConfigDate
        Configure the 'Date' column and displayed date in message header
• Enigmail
        OpenPGP message encryption and authentication
• Exif Viewer
        Extracts and displays the Exchangeable Image File (Exif) data, as stored by digital still cameras, in both local and remote JPEG images.
• FoxyTunes
        Control any media player from Firefox and more...
• Image Zoom
        Adds zoom functionality for images
• Restart Thunderbird
        Restart Thunderbird with ease
• SenderFace
        SenderFace enables you to associate images (faces) with Email senders (from field).
• Show InOut
        Adds columns to ThreadPane indicating if a mail is incoming or outgoing
• SmoothWheel
        Scrolls the document smoothly when scrolling the mouse wheel
• TripleSelect
        Select a paragraph by triple-clicking on text.
• URL Link
        Allow navigation to broken/unlinked URLs

Now to find someone who I can test out things like encrypted mail at the touch of a button.
I also haven't yet got SenderFace to work yet, but I'm sure I will get it to work, then I'll find photos of friends, and have their pictures appear in my mail when they send me messages :-)