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Sylpheed

Sylpheed is an open-source e-mail client and news client licensed under the GPL. It provides easy configuration and an abundance of features. It stores mail in the MH Message Handling System. Sylpheed runs on Unix-like systems such as Linux or BSD, and Windows. It uses GTK+.

In 2005, Sylpheed was forked to create Sylpheed-Claws, now known as Claws Mail. As of 2015, both projects continue to be developed independently.

Sylpheed is the default mail client in Lubuntu, Damn Small Linux and Puppy Linux.