Claws Mail

Main window of Claws Mail 2.7.1
Developer(s)	The Claws Mail Team
Initial release	May 11, 2001; 22 years ago (2001-05-11)
Stable release	4.2.0[1]  / 20 November 2023
Preview release	None [±]
Repository	git.claws-mail.org?p=claws.git%3Ba%3Dsummary
Written in	C (with GTK)
Operating system	BSD, Linux, macOS, Solaris, Unix, Windows
Type	E-mail client, news client
License	GPL-3.0-or-later
Website	www.claws-mail.org

Claws Mail is a free and open-source, C/GTK-based e-mail client, which is both lightweight and highly configurable.^[2][3] Claws Mail runs on both Windows^[4] and Unix-like systems such as Linux, BSD, and Solaris. It stores mail in the MH mailbox format. Plugins allow to read HTML mail, but there is none to compose HTML messages.^[5]

Features

Claws Mail is also a news client and RSS aggregator. Further features – integrated or supplied via plugins – include:^[6][7]

• Search and filtering, optionally via Perl and Python scripting
• Security (GPG, SSL, anti-phishing)
• Anti-spam (SpamAssassin, Bogofilter)
• Per-folder preferences
• Optional external editor
• Templates for messages
• Themes support, customisable toolbars, X-Face support, foldable quotes
• Viewers for HTML mail (Dillo, Gtkhtml2, Fancy (WebKit), LiteHTML)
• TNEF attachment parser
• PDF viewer
• Various notification plugins, e. g. trayicon and LED handler
• Archiving, import/export from standard formats^[8]
• Support for Mbox mailbox format
• Calendaring with events as kind of messages^[9]

History

Development started in April 2001 as Sylpheed-Claws off the development version of Sylpheed, where new features could be tested and debugged. In August 2005 Claws Mail forked completely from Sylpheed.