# mjl-/mox

modern full-featured open source secure mail server for low-maintenance self-hosted email

Repository: https://github.com/mjl-/mox
Canonical: https://ross.abutalabs.com/products/mox
Homepage: https://www.xmox.nl
Language: Go
License: MIT
License Family: permissive
Last push: 2026-08-23T14:07:57+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 86, longevity 93
- inputs: {"age_days": 1311, "days_push": 10, "days_rel": 14, "gap_med": 74, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5826, forks 217 (observed 2026-08-28T04:09:30.103919+00:00)

## What it is
Mox is an all-in-one, secure, open source mail server written in Go, combining SMTP, IMAP4, webmail, SPF/DKIM/DMARC, DANE/MTA-STS, automatic TLS via ACME, and spam filtering in a single binary. It is designed for low-maintenance self-hosted email, with a quickstart setup, web admin interface, HTTP/JSON API for transactional email, and a localserve mode for testing.

## Use cases
- self-host email for my own domain
- run a modern SMTP and IMAP server
- send transactional email from my app via API
- replace Postfix/Dovecot/spam-filter stack with one service
- test email sending locally during development
- serve a website and mail from the same machine on port 443

## When to choose
- you want a single all-in-one mail server that is quick to set up and low-maintenance
- you want modern email security (SPF/DKIM/DMARC, DANE, MTA-STS, REQUIRETLS) out of the box
- you want built-in webmail, admin UI, and an HTTP API for transactional email
- you prefer a memory-safe Go implementation over C-based mail servers

## When to avoid
- you need a highly customized multi-component mail stack with separate MTA/IMAP/spam services
- you rely on direct filesystem access to mailboxes in Maildir format
- you need features mox explicitly does not support per its roadmap
- you need battle-tested decades-old software for very large-scale deployments

## Facets
- artifact type: application
- maturity: active
- function: email, http-server, web-framework, monitoring, security, self-hosted, cli
- domain: email, self-hosted, networking, security, developer-tools
- platform: go, cross-platform, self-hosted
- tags: mail-server, smtp, imap, webmail, spf, dkim, dmarc, dane, mta-sts, acme, spam-filtering, jmap-alternative, transactional-email, linux, docker, web-server

## Member repositories
- mjl-/mox (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:30.103919+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 2026-08-29T17:52:06.364555+00:00, confidence not recorded.
  - readme: https://github.com/mjl-/mox (fetched 2026-08-28T04:09:30.103919+00:00, sha 59ae9e74b240)
  - homepage: https://www.xmox.nl (fetched 2026-08-29T08:47:37.639835+00:00, sha cf50dd65e151)
  - site_page: https://www.xmox.nl/features (fetched 2026-08-29T08:47:37.643401+00:00, sha e09bb5ac4be3)
  - site_page: https://www.xmox.nl/install (fetched 2026-08-29T08:47:37.646286+00:00, sha 3c86b6ec866f)
  - site_page: https://www.xmox.nl/faq (fetched 2026-08-29T08:47:37.648498+00:00, sha 3157c65ce1e8)
- Data as of 2026-08-30T08:39:29.467469+00:00.