Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). Sylpheed is a tool that allows you to receive and send emails. Sylpheed mainly runs on Unix-like systems such as Linux, BSD, and Mac OS X. Here are some key features of "Sylpheed": - Simple, beautiful, and well-polished user interface - Comfortable operationality which is built in detail - Lightweight operation - High reliability - Internationalization and Multilingualization support - High-level Japanese processing - Various protocols support - Security features (GnuPG, POP3/IMAP4/NNTP over SSL/TLSv1) - Powerful filtering - Junk mail control - Flexible cooperation with external commands