Mutt was originally written by Michael Elkins in 1995 and released under the GNU General Public License version 2 or any later version.
The mutt slogan is "All mail clients suck. This one just sucks less".
Mutt supports most mail formats (notably both mbox and Maildir) and protocols (POP3, IMAP, etc.). It also includes MIME support, notably full PGP/GPG and S/MIME integration.
Mutt has hundreds of configuration directives and commands. It allows for changing all the key bindings and making keyboard macros for complex actions, as well as the colors and the layout of most of the interface. Through variants of a concept known as "hooks", many of its settings can be changed based on criteria such as current mailbox or outgoing message recipients. There are also many patches and extensions available that add functionality, such as NNTP support or a sidebar similar to those often found in graphical mail clients.