One IMO important thing that's missing from others' replies: It's extremely simple to integrate other programs for processing your mails. Want to be able to imp

One IMO important thing that's missing from others' replies: It's extremely simple to integrate other programs for processing your mails. Want to be able to import patches sent to you into some git repository? Just write a small shell script that accepts the mail (or some attachment) as input and then create a keyboard shortcut in mutt that pipes the mail (or attachment) to that script, done. You don't need to extend mutt in order to be able to programmatically process your emails, you simply use standard unix mechanisms (a pipe or maybe a file) and call an external program.