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mu is a set of utilities to deal with Maildirs, specifically, indexing and searching.

It can be integrated with other e-mail clients such as mutt and Wanderlust. It provides an emacs-based e-mail client based on mu called mu4e. It also allows Guile 2.0 bindings that allow for scripting, advanced processing of your data, and doing all kinds of statistics.

Component programs:

  • mu-for-emacs (mu4e): a full-featured e-mail client that runs inside emacs
  • mu-guile: bindings for the Guile/Scheme programming language
  • a toy GTK+-interface called mug (in the ‘toys/’ subdir)


Main commands are:
  1. mu index: recursively scans a collection of email messages, and stores information found in a database.
  2. mu find: searches for messages based on some search criteria.
  3. mkmdir: creates a new Maildir.


Download version (developmental)
released on 22 September 2015

VCS Checkout



LicenseVerified byVerified onNotes
GPLv3genium31 July 2014

Leaders and contributors

Dirk-Jan C. Binnema (aka djcb) maintainer

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Developer Homepage
User Bug Tracking
User Download

Software prerequisites

This entry (in part or in whole) was last reviewed on 24 September 2015.


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