Difference between revisions of "Mu"

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|Version date=2020/04/29
|Version date=2020/04/29
|Version status=stable
|Version status=stable
|Version download=https://github.com/djcb/mu/releases/download/1.4.1/mu-1.4.1.tar.xz
|Version download=https://github.com/djcb/mu/releases/download/1.4.3/mu-1.4.3.tar.xz
|Last review by=Genium
|Last review by=Genium
|Last review date=2020/04/29
|Last review date=2020/04/29

Latest revision as of 09:30, 29 April 2020



maildir indexer/searcher + emacs mail client + guile bindings

Mu is a tool for dealing with e-mail messages stored in the Maildir-format. Mu's purpose in life is to help you to quickly find the messages you need; in addition, it allows you to view messages, extract attachments, create new maildirs, and so on.


Mu was written an e-mail indexer/searcher in 2008. The author was using mutt, then Wanderlust and later, wondered if he could use mu as the backend for an emacs-based e-mail client. So the the first version of… mu4e was realized in 2012.


Mu includes an emacs-based e-mail client (mu4e), a simple GUI (mug) and bindings for the Guile programming language.


Documentation available for mu and mu4e.



Under the hood, mu4e is fully search-based, similar to programs like notmuch and sup.

However, mu4e’s user-interface is quite different. mu4e’s mail handling (deleting, moving etc.) is inspired by Wanderlust (another Emacs-based e-mail client), mutt and the dired file-manager for emacs.

mu4e keeps all the ‘state’ in your maildirs, so you can easily switch between clients, synchronize over IMAP, backup with rsync and so on. The Xapian-database that mu maintains is mererly a cache; if you delete it, you won’t lose any information.

More information at https://www.djcbsoftware.nl/code/mu/mu4e/

What mu4e does not do

There are a number of things that mu4e does not do, by design:

  • mu/mu4e do not get your e-mail messages from a mail server. Nor does it sync-back any changes. Those tasks are delegated to other tools, such as offlineimap, isync/mbsync or fetchmail; As long as the messages end up in a maildir, mu4e and mu are happy to deal with them.
  • mu4e also does not implement sending of messages; instead, it depends on smtpmail, which is part of Emacs. In addition, mu4e piggybacks on Gnus’ message editor; See Message Manual.

Thus, many of the things an e-mail client traditionally needs to do, are delegated to other tools. This leaves mu4e to concentrate on what it does best: quickly finding the mails you are looking for, and handle them as efficiently as possible.

More information at https://www.djcbsoftware.nl/code/mu/mu4e/

Related Projects

Extension or Plugin

This package can be used as an extension, plugin, or add-on to:



Verified by

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25 April 2020



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Verified on

25 April 2020

Leaders and contributors

Dirk-Jan C. Binnema (aka djcb) maintainer

Resources and communication

AudienceResource typeURI
DeveloperVCS Repository Webviewhttps://github.com/djcb/mu
GitHubBug Trackinghttps://github.com/djcb/mu/issues/

Software prerequisites

This entry (in part or in whole) was last reviewed on 29 April 2020.


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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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