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]
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.
^Cat Ellis (2017-05-27). "Claws Mail review. Manage multitudes of messy messages". techradar. Claws Mail looks simple, but is packed with advanced tools for power users. New users might be happier with Mailbird or Thunderbird, but you'd be hard pressed to find a better tool for taming multiple inboxes.
^Razvan Serea (2017-12-24). "Claws Mail 3.16.0.1". Neowin. The Claws Mail developers try hard to keep it lightweight, so that it should be usable on low-end computers without much memory or CPU power.
