Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.

Through mu, mu4e sits on top of your Maildir (which you update with e.g. offlineimap or fetchmail). mu4e is designed to enable super-efficient handling of e-mail; searching, reading, replying, moving, deleting. The overall ‘feel’ is a bit of a mix of dired and Wanderlust.

Features include:

For all the details, please see the manual, or check the screenshots below. mu4e is part of the normal mu source package and also [[][available on Github]].


The main view

The headers view

The message view

The message/headers split view (

The message/headers split view, and speedbar support.

View message as pdf (

mu4e was designed and implemented by Dirk-Jan C. Binnema, and is Free Software, licensed under the GNU GPLv3