Thunderbird

Mozilla Thunderbird+enigmail

$ wget -c http://sunsite.rediris.es/pub/mozilla.org/thunderbird/releases/2.0.0.9/linux-i686/pt-BR/thunderbird-2.0.0.9.tar.gz
$ tar zxvf thunderbird-2.0.0.9.tar.gz
# mv thunderbird /usr/share
# ln -s /usr/share/thunderbird/thunderbird /usr/bin
$ wget --no-check-certificate https://addons.mozilla.org/en-US/thunderbird/downloads/file/20480/enigmail-0.95.5-tb+sm.xpi

Abra o Thunderbird e vá em Ferramentas > Complementos > Instalar > localize o arquivo .xpi > instale e reinicie o aplicativo.

pronto!

cat thunderbird.desktop

[Desktop Entry]
Encoding=UTF-8
Name=Thunderbird Cliente de e-mail
Name[pt_BR]=Thunderbird Cliente de e-mail
GenericName=Cliente de e-mail
GenericName[pt_BR]=Cliente de e-mail
Comment[pt_BR]=Cliente de e-mail
Exec=thunderbird
StartupNotify=true
Terminal=false
Type=Application
Icon=thunderbird50.xpm
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=Thunderbird
X-GNOME-Bugzilla-Component=General
Categories=Application;Network;GNOME;GTK;Email;
MimeType=text/html;text/xml;application/xhtml+xml;

# cp thunderbird.desktop /usr/share/applications/
# cp /usr/share/thunderbird/icons/mozicon50.xpm /usr/share/icons/thunderbird50.xpm