DJCB over at EMACS-FU is announcing the release of Version 0.9.9 of mu4e, his Emacs-based email client. It looks good enough that I am tempted to give up the native Mac email client1. It has dynamic folders that will move messages to different folders depending on context. You can write Elisp functions to control that context so it’s very flexible.
A related feature is refiling that will automatically store received messages based on context. Usually you would want this based on the sender’s email address but, like dynamic folders, it’s configurable by writing Elisp code so should handle special requirements easily.
The most significant feature for me is the encryption/signing functionality. DJCB says that it’s still a little rough but rough is better than none at all which, as the footnote explains, is the predicament that OS X 10.8 users find themselves in.
Head on over to EMACS-FU and take a look at the new features (or see the NEWS file) for mu4e. It looks like an excellent application.