This extension implements RFC 2369 for Thunderbird: Special mailing list header fields in the mail are parsed, and the links are displayed in the extended header view. You can click them to simply go to the archive, request help or unsubscribe from the list. You have to install Enigmail OR Mnenhy, as this extension relies on getting special headers from the mail which is very complicated to achieve in current versions of thunderbird.
Fortune : Q: Why is Poland just like the United States? A: In the United States you can't buy anything for zlotys and in Poland you can't either, while in the U.S. you can get whatever you want for dollars, just as you can in Poland. -- being told in Poland, 1987