Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
Sylpheed has the following features:
Ã‚Â· Simple, beautiful, and well-polished user interface
Ã‚Â· Comfortable operationality which is built in detail
Ã‚Â· Immediately available with minimal configuration
Ã‚Â· Lightweight operation
Ã‚Â· High reliability
Ã‚Â· Internationalization and Multilingualization support
Ã‚Â· High-level Japanese processing
Ã‚Â· Various protocols support
Ã‚Â· Security features (GnuPG, SSL/TLSv1)
Ã‚Â· Powerful filtering and search
Ã‚Â· Junk mail control
Ã‚Â· Flexible cooperation with external commands
Sylpheed is free and runs on Unix-like systems such as Linux, BSD, Windows 2000/XP/Vista/7 and Mac OS X.