Heavy duty browser for mail folders

 Buffy is a program that displays a compact summary of your mail folders, and
 allows one to invoke a command (usually a mail reader) on them. It is written
 with the intent of being a handy everyday tool for people handling large
 volumes of mail. For mutt users, this can be a nice front-end to supplement
 the simple built-in folder browser when one has many folders to keep track of.
 .
 Buffy tries hard to work out of the box: it looks for mail folders in sensible
 places and comes with reasonable defaults.
 .
 The program is functional but still very young, and only Maildir and
 Mailbox format are supported at the moment.