Main window of Claws Mail 2.7.1
|Developer(s)||The Claws Mail Team|
|Initial release||May 11, 2001|
|Stable release||3.16.0 (December 17, 2017 ) [±]|
|Preview release||None [±]|
|Written in||C (with GTK+)|
|Operating system||BSD, Linux, macOS, Solaris, Unix, Windows|
|Type||E-mail client, news client|
Claws Mail is a free and open-source, GTK+-based email and news client. It offers easy configuration and an abundance of features. It stores mail in the MH mailbox format and also the Mbox mailbox format via a plugin. Claws Mail runs on both Windows and Unix-like systems such as Linux, BSD, and Solaris.
Formerly known as Sylpheed-Claws, it started in April 2001 as the development version of Sylpheed, where new features could be tested and debugged, but evolved enough to now be a completely separate program. It forked completely from Sylpheed in August 2005.
Claws Mail is unable to send HTML mail. This is intentional. According to the developers, this decision has been made after a discussion, although no details are given. It is still possible to receive HTML mail using Claws Mail.