# useplunk/plunk

The Open-Source Email Platform

Repository: https://github.com/useplunk/plunk
Canonical: https://ross.abutalabs.com/products/plunk
Homepage: https://www.useplunk.com
Language: TypeScript
License: AGPL-3.0
License Family: copyleft
Last push: 2026-08-24T15:06:14+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 55
- inputs: {"age_days": 782, "days_push": 9, "days_rel": 16, "gap_med": 12, "n_releases_24m": 16}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5396, forks 400 (observed 2026-08-28T04:09:17.326709+00:00)

## What it is
Plunk is an open-source, self-hostable email platform combining transactional email sending (API and SMTP), marketing campaigns, and event-triggered workflow automation against a single contact list. It offers dynamic segmentation, a visual email editor, inbound email processing, analytics, and an MCP server for AI agent integration, positioned as an alternative to SendGrid, Resend, and Mailgun.

## Use cases
- send transactional emails like password resets from my app
- self-host an alternative to SendGrid or Mailgun
- build automated onboarding email sequences
- send newsletters to segmented audiences
- receive and process inbound emails at my domain
- send email via SMTP from existing tools
- manage a large contact list without per-contact pricing
- let AI agents draft and send email campaigns

## When to choose
- you want full data ownership and self-hosting with Docker
- you need transactional email, campaigns, and automation in one tool
- you have a growing contact list and dislike per-contact pricing
- you want event-triggered workflows with branching and delays
- you need both SMTP relay and REST API sending

## When to avoid
- you need a fully managed service and cannot run infrastructure
- you require deep marketing features like A/B testing or landing pages found in Mailchimp
- your license requirements are incompatible with AGPL-3.0
- you only need a simple SMTP relay without a dashboard

## Facets
- artifact type: application
- maturity: active
- function: email, workflow-automation, webhook, analytics, mcp, api-framework, self-hosted
- domain: email, developer-tools, self-hosted, apis
- platform: self-hosted
- tags: transactional-email, email-marketing, smtp-relay, email-campaigns, marketing-automation, contact-management, email-templates, inbound-email, sendgrid-alternative, mailgun-alternative, marketing, automation, docker, web-server, nodejs, typescript

## Member repositories
- useplunk/plunk (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:17.326709+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 2026-08-29T17:58:22.713898+00:00, confidence not recorded.
  - readme: https://github.com/useplunk/plunk (fetched 2026-08-28T04:09:17.326709+00:00, sha 33262da7c8bf)
  - homepage: https://www.useplunk.com (fetched 2026-08-29T08:53:00.430090+00:00, sha 6e41bf3f7cd2)
  - site_page: https://docs.useplunk.com (fetched 2026-08-29T08:53:00.442142+00:00, sha 4dd10c03b1d0)
  - site_page: https://www.useplunk.com/features/workflows (fetched 2026-08-29T08:53:00.443898+00:00, sha 5122cf9a76f7)
  - site_page: https://www.useplunk.com/features/segments (fetched 2026-08-29T08:53:00.445588+00:00, sha 2243d1e307e9)
  - site_page: https://www.useplunk.com/features/inbound-email (fetched 2026-08-29T08:53:00.447120+00:00, sha 40f8bd978c10)
  - site_page: https://www.useplunk.com/features/email-editor (fetched 2026-08-29T08:53:00.448837+00:00, sha 33bfcd135a3d)
  - site_page: https://www.useplunk.com/features/smtp (fetched 2026-08-29T08:53:00.450381+00:00, sha 0414cb6cc594)
  - site_page: https://www.useplunk.com/features/mcp (fetched 2026-08-29T08:53:00.452088+00:00, sha b2af45aafa0d)
  - site_page: https://www.useplunk.com/pricing (fetched 2026-08-29T08:53:00.439781+00:00, sha 99c02ecef7ee)
- Data as of 2026-08-30T08:39:29.467469+00:00.