Sylpheed is a simple, lightweight but featureful, and easy-to-use email client. It has a well-polished and comfortable user interface. It has many features such as multiple accounts, thread display, MIME, powerful filtering, various search interface, spell checking, and junk mail control. It supports common email protocols such as POP3, IMAP4rev1, SMTP, and security features such as GnuPG and SSL/TLSv1. It is also fully internationalized and multilingualized. License: GNU General Public License (GPL) Changes:
The POP3 remote mailbox feature was added, which enables the direct viewing, downloading, and deletion of messages on POP3 server. The backups of configuration files are kept for four generations now. Some other feature improvements and bugfixes were made.