http://vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd.onion/el/about-us/newsletter/2009/07
Thunderbird has
many features, including: IMAP and POP support, multiple accounts, quick
search, spell as you type, advanced spam controls, RSS, virtual folder
views, message filtering, addressbook, and support for GPG encryption.