I’ll publish my .muttrc one of these days.
I like it for its:
– automatic regular-expression-based colorization (in list view and message body view).
– single-key operations.
– clean interface. Much less scary than pine!
– ability to read mbox files nicely and thus share message stores with Evolution (home) and Thunderbird (work). So I can jump back and forth between my GUI-based MUA and mutt.