# axllent/mailpit

An email and SMTP testing tool with API for developers

Repository: https://github.com/axllent/mailpit
Canonical: https://ross.abutalabs.com/products/mailpit
Homepage: https://mailpit.axllent.org
Language: Go
License: MIT
License Family: permissive
Topics: email-testing, go, golang, smtp-server, smtp-relay, smtp-testing, mailpit, pop3-server
Last push: 2026-08-21T23:59:24+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 1496, "days_push": 12, "days_rel": 12, "gap_med": 10, "n_releases_24m": 62}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 10209, forks 329 (observed 2026-08-28T04:10:39.874448+00:00)

## What it is
Mailpit is a lightweight, zero-dependency email and SMTP testing tool for developers that acts as a local SMTP server and captures outgoing mail. It provides a modern web UI to inspect messages, plus a REST API, POP3 server, and features like HTML compatibility checks, link checking, spam analysis, and message relaying.

## Use cases
- capture emails sent by my app during local development
- test email sending without sending to real users
- run an SMTP server for integration testing
- inspect HTML emails and check email client compatibility
- query captured emails via an API in automated tests
- replace MailHog for email testing
- check spam score of my emails with SpamAssassin
- view test emails in a web interface

## When to choose
- you need a fast, low-memory local SMTP catch-all for development or CI
- you want automated email assertions via a REST API
- you need HTML/link/spam analysis tooling for email testing
- you want a maintained MailHog replacement with Docker images

## When to avoid
- you need a production mail transfer agent or real email delivery
- you need a hosted/team email testing service with shared inboxes (though Mailtrap integration exists)
- you require full IMAP support

## Facets
- artifact type: application
- maturity: active
- function: email, testing, http-server, webhook, developer-tools
- domain: email, developer-tools, testing, self-hosted
- platform: windows, self-hosted, cross-platform, go
- tags: smtp-server, email-capture, mail-testing, rest-api, pop3, mailhog-alternative, integration-testing, spamassassin, linux, macos, docker

## Member repositories
- axllent/mailpit (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:39.874448+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 2026-08-29T17:19:35.623288+00:00, confidence not recorded.
  - readme: https://github.com/axllent/mailpit (fetched 2026-08-28T04:10:39.874448+00:00, sha 0eb094f2bf50)
  - homepage: https://mailpit.axllent.org (fetched 2026-08-29T08:19:18.767651+00:00, sha 8019acf8b824)
  - site_page: https://mailpit.axllent.org/about (fetched 2026-08-29T08:19:18.776764+00:00, sha 61d1346014a9)
  - site_page: https://mailpit.axllent.org/docs (fetched 2026-08-29T08:19:18.779121+00:00, sha e01e777358bc)
  - site_page: https://mailpit.axllent.org/docs/install (fetched 2026-08-29T08:19:18.780902+00:00, sha d47b7b74b3a3)
  - site_page: https://mailpit.axllent.org/docs/usage/notifications (fetched 2026-08-29T08:19:18.782439+00:00, sha ec6e7d1a636f)
  - site_page: https://mailpit.axllent.org/docs/usage/html-check (fetched 2026-08-29T08:19:18.783924+00:00, sha ea428b48dab7)
  - site_page: https://mailpit.axllent.org/docs/usage/link-check (fetched 2026-08-29T08:19:18.785486+00:00, sha 437178b280d2)
  - site_page: https://mailpit.axllent.org/docs/usage/spamassassin (fetched 2026-08-29T08:19:18.787004+00:00, sha cb76628d30de)
  - site_page: https://mailpit.axllent.org/docs/usage/html-screenshots (fetched 2026-08-29T08:19:18.788391+00:00, sha 4d58bd49da22)
- Data as of 2026-08-30T08:39:29.467469+00:00.