mu4e

At a glance

• Editor score
  3.0 / 10
• Pricing
  Open source
• Best for
  Emacs users wanting search-driven email
• Paid from
  Free
• App coverage
  Desktop
• Facts checked
  20 Sep 2026

• Where it wins

  • Search-based handling replaces folder-first email workflows
  • Supports encryption, multiple account contexts, and offline queued sending
  • Handles iCalendar event viewing and replies within the email client

• Where it doesn't

  • Requires GNU Emacs and messages stored in a local Maildir
  • Linux-only coverage limits platform flexibility
  • Email retrieval may require external tools such as mbsync or fetchmail

Our verdict on mu4e

mu4e is an email client for GNU Emacs, built on the mu email-search engine. It is designed for Emacs users who manage email locally in Maildir format and prefer queries over folder-based navigation. The client supports reading, replying, composing, moving, and deleting messages, along with attachments, address autocompletion, multiple account contexts, message signing and encryption, offline queued sending, and iCalendar event viewing and replies. It is distributed as Free Software under the GNU GPLv3 license.

The main setup consideration is its local, Emacs-centered workflow. mu4e requires GNU Emacs and messages stored in a local Maildir. Retrieval may involve external tools such as mbsync, offlineimap, fetchmail, or getmail, so it fits users who are comfortable assembling an email workflow around local message storage. Its published platform coverage is Linux, and its desktop focus makes it a better match for a configured local environment than for users seeking a broadly cross-platform client with built-in account setup.

Search is the defining feature: messages are managed through queries rather than a conventional folder-first interface. Asynchronous processing is intended for heavy actions, while multiple account contexts help separate different mail identities. Encryption, queued sending during offline periods, and iCalendar handling add useful depth beyond basic reading and replying. Choose mu4e if Emacs integration, local Maildir control, and search-driven navigation matter most. Consider another email client if you need non-Linux support, want retrieval included in the primary application, or prefer a more conventional interface.

Your product? Our editors can test mu4e in depth and publish a review, labelled as paid · from $149/mo →

mu4e pricing

mu4e fact sheet

Alternatives to mu4e

• Mozilla ThunderbirdA capable free client for multi-account email, offline access, and desktop productivity tools.9.4
• Zoho MailA flexible hosted email service with free access, migration tools, and Zoho collaboration options.9.2
• Apple MailA capable Apple-focused email client with unified inboxes, scheduling, privacy controls, and AI assistance.9.1

See all mu4e alternatives →

Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update