Sylpheed is an e-mail client (and news reader) based on GTK+

Currently, many features are supported including POP3, IMAP, NNTP,
multiple accounts, threading, filtering, MIME attachments, APOP, SMTP
AUTH, SSL, IPv6, GnuPG, internalization, and more.

In addition to the above, Sylpheed-claws has a lot of extra features,
e.g. a plugin mechanism, a new filtering/processing mechanism,
extra folder properties and much more...

WWW: http://sylpheed-claws.sourceforge.net/

- Simon 'corecode' Schubert