New mutt 1.5.15 has a very nice new feature!
Just found today when I was looking to see if I missed something with the mutt sidebar patch (still irritates me that I have to sync a mailbox before jumping to another mailbox in order for the counts in the sidebar to be updated properly), that mutt 1.5.15 was released earlier this month. This is an extremely worthwhile upgrade, especially because it now has SMTP support built-in. It's about time!
No more having to use exim or postfix to relay the mail, you can now send the mail out directly from mutt itself.