mu4e
The facts below are what the maker publishes about mu4e, checked and dated. Our editors have not written about it yet.
Plans and prices
From mu4e's own pricing page, checked 12 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| mu4e | Free | GNU Emacs email client · GPLv3 · requires mu and Maildir |
The facts
Each one read from mu4e's own pages, with the date it was checked.
Where it runs
- App coverage
- desktopchecked 20 Sep 2026
- Platform limitation
- The mu project's Windows support is described as experimental and not supportable by its maintainers due to lack of specific expertise.checked 12 Oct 2026
What it does
- Calendar tools
- Yeschecked 20 Sep 2026
- Contacts
- Address auto-completion uses contacts found in the user's messages.checked 12 Oct 2026
- Customization
- Users can extend mu4e with custom actions and their own Emacs Lisp snippets.checked 12 Oct 2026
- Download
- mu4e is included in the mu source package, which is available from GitHub; some Linux distributions provide pre-built mu packages.checked 12 Oct 2026
- Encryption and signing
- The manual lists support for signing, encrypting, and decrypting messages.checked 12 Oct 2026
- Integrations
- The manual documents integration with Emacs facilities including Org-mode, desktop notifications, DBus, Dired, and iCalendar.checked 12 Oct 2026
- License
- mu4e is Free Software licensed under the GNU GPLv3.checked 12 Oct 2026
- Mail retrieval
- mu4e works on a Maildir that can be updated by tools such as offlineimap, mbsync, or fetchmail.checked 12 Oct 2026
- Offline access
- Yeschecked 20 Sep 2026
- Requirements
- The mu project installation instructions say mu4e requires Emacs version 28 or later to build its documentation.checked 12 Oct 2026
- Search
- The interface is search-based, using queries instead of folders.checked 12 Oct 2026
- Sending mail
- Sending mail uses Emacs's smtpmail package, configured for the user's SMTP provider.checked 12 Oct 2026
- Speed
- The interface is optimized for quick common actions, and heavy actions run asynchronously so they do not block Emacs.checked 12 Oct 2026
- Support
- The project directs bug reports and feature requests to its issue tracker and provides a mu-discuss mailing list.checked 12 Oct 2026
- Unified inbox
- Yeschecked 20 Sep 2026
- What it does
- mu4e is an email client for GNU Emacs, built on the mu email search engine, for searching, reading, replying to, moving, and deleting Maildir messages.checked 12 Oct 2026
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