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 is a free software distributed under the GNU GPL (the library part is GNU LGPL). You can freely use, modify and redistribute it under the license.

Features:

· Simple, beautiful, and well-polished user interface
· Comfortable operationality which is built in detail
· Immediately available with minimal configuration
· 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

What's New:

· The Japanese manual was updated.
· The 'Enable address auto-completion' setting was added.
· Update check (curl command) timeout was set to 10 seconds.
· The compile error with OpenSSL disabled was fixed.
· Win32: multiple reference to a folder with different letter case is prohibited when creating a new one.
· Some minor bugs were fixed.

Download: Sylpheed 3.2 Beta 7 (6.3 MB) | Portable Sylpheed 3.2 Beta 7 (8.2 MB) | Sylpheed 3.1.3 (6.2 MB) | Portable Sylpheed 3.1.3 (8.2 MB) | Screenshots | Homepage