Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail 
client (mailer, MUA).

Sylpheed runs on Unix-like systems such as Linux, BSD, and Mac OS X. It 
also supports Windows.

Sylpheed uses GTK+ GUI toolkit. The newest version of Sylpheed works with 
GTK+ 2.4 or later (2.6 or later is recommended).

Sylpheed has the following features:

* Simple, beautiful, and well-polished user interface
* Comfortable operationality which is built in detail
* Well-organized, easy-to-understand configuration
* Lightweight operation
* High reliability
* Internationalization and Multilingualization support
* High-level Japanese processing
* Various protocols support
* Security features (GnuPG, SSL/TLSv1)
* Powerful filtering and search
* Junk mail control
* Flexible cooperation with external commands
