# djcb/mu

maildir indexer/searcher + emacs mail client + guile bindings

Repository: https://github.com/djcb/mu
Canonical: https://ross.abutalabs.com/products/mu
Homepage: http://www.djcbsoftware.nl/code/mu
Language: C++
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-26T19:54:33+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 84, longevity 100
- inputs: {"age_days": 5353, "days_push": 7, "days_rel": 24, "gap_med": 55.0, "n_releases_24m": 13}
- flags: no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1718, forks 407 (observed 2026-08-28T04:05:26.556824+00:00)

## What it is
mu is a set of command-line tools for indexing and searching email stored in the Maildir format on Unix-like systems. It also includes mu4e, an Emacs-based email client, and Guile/Scheme bindings for scripting.

## Use cases
- instantly find that one important email in a large maildir
- index and search maildir email from the command line
- read and manage email inside Emacs with mu4e
- extract attachments from email messages
- search messages by sender, date, size, flags, or attachments
- script email handling with Guile/Scheme

## When to avoid
- you need a graphical email client
- your mail lives on a proprietary server without local Maildir access
- you need Windows-native support

## Facets
- artifact type: cli-tool
- maturity: active
- function: search-engine, cli, email
- domain: email, developer-tools
- platform: bsd, cli
- tags: maildir, mu4e, emacs-mail-client, guile-bindings, full-text-search, command-line, linux, macos, emacs

## Member repositories
- djcb/mu (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:26.556824+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:34:10.102682+00:00, confidence not recorded.
  - homepage: http://www.djcbsoftware.nl/code/mu (fetched 2026-08-29T11:10:09.594068+00:00, sha b1fad9cefddb)
  - site_page: https://www.djcbsoftware.nl/about.html (fetched 2026-08-29T11:10:09.596784+00:00, sha b135802a4165)
- Data as of 2026-08-30T08:39:29.467469+00:00.