Ask HN: Best Command Line Email Client?

I've used Alpine / Elm / Mutt. I've used gMail / Yahoo Mail / HotMail. I've used Evolution. I don't like any of them.

I spend 90%+ of my time on urxvt/screen/emacs/irssi. If I can get a email client that integrates nicely into this, it'd be ideal. What I think I really want is something that allows me to FUSE mount my email directory. So I can cd into my directories, ls to see new messages, write messages in a directory, and move them into ~/Mailbox/send/ ... to have them sent, etc ...

Anyone know of anything remotely like this? (Or a really cool email setup they use themselves.)

[On, on the FUSE side, I really like this since it allows me to use tools like grep, rm, sed / awk, ... to do funky things with my email.]