The open-source email platform. Send one. Send a million.
Self-host on your own AWS SES, or use the hosted cloud. Resend-compatible API — migrating means changing two environment variables, not rewriting your integration.
Features
| Feature | Status | Notes |
|---|---|---|
| Emails API (Resend-compatible) | ✅ | Send, batch, get, cancel — same request/response shapes as Resend. |
| Idempotency | ✅ | Idempotency-Key header dedupes retried sends. |
| API keys | ✅ | Create and revoke ms_ keys from the dashboard, with last-used tracking. |
| Suppression list | ✅ | Hard bounces and complaints suppressed automatically; review and remove per address, or manage via /suppressions (batch add/remove up to 1000). |
| Metrics | ✅ | Daily sends with bounce and complaint rates tracked against SES thresholds. |
| Webhooks (Standard Webhooks) | ✅ | Signed event deliveries (webhook-* and svix-* headers) with per-endpoint event selection, a delivery log, and bring-your-own whsec_ secret. |
| Domains + BYODKIM | ✅ | Guided DNS verification; bring your own DKIM key or let SES manage it. |
| Contacts | ✅ | Team-wide contacts with subscribe state, segments, topics, CSV import, and bulk POST /contacts/batch. |
| One-click unsubscribe (RFC 8058) | ✅ | List-Unsubscribe headers plus a hosted unsubscribe page. |
| Broadcasts | ✅ | Compose, schedule, and send to all contacts, a segment, or a topic; cancel while scheduled. |
| Templates + merge fields | ✅ | Reusable templates with per-contact merge fields; /templates API with per-team aliases. |
| API request logs | ✅ | Every API request recorded with request/response bodies, secrets redacted. |
| SMTP relay | ✅ | Drop-in SMTP on port 2587; authenticate with an API key. |
| Receiving | Beta | Mail to any address on a verified domain, through an MX the instance runs (PROCESS=mx); Resend's emails.receiving API, forward() included, and the email.received webhook. |
| Dashboard (en/pt-BR) | ✅ | Full dashboard in English and Brazilian Portuguese. |
| Self-host (Docker) | ✅ | Compose file plus a setup wizard; sends through your own AWS SES. |
| Migrate from Resend | ✅ | npx @millionsend/cli migrate --from resend moves contacts, segments, topics, templates, webhooks, domains and suppressions; read-only against Resend, safe to re-run before cutover. |
| Content monitoring | ✅ | Optional outbound judge via TypeSafe Jev. Off by default on self-host. |
The hosted monitor uses TypeSafe's Jev, a System One model built for typed decisions in software. A new team's mail in its first window and its broadcasts, and any team's mail to a destination it has never used, are scored before SES takes them and wait for the verdict, about half a second; everything else is sampled after it is sent, and sending never waits on it. Self-hosters leave it off unless they set ABUSE_JUDGE=typesafe.
Run it locally
One command, in an empty directory — no clone needed:
npx @millionsend/setup
The wizard creates .env (secrets generated for you), optionally provisions
the AWS resources (IAM user, SNS event topic, SES configuration set), and
starts the prebuilt image with docker compose up -d. Every step is offered,
skippable, and safe to re-run. Prefer doing it by hand? The manual curl path
and everything else — from-source build, SES/SNS event pipeline, Docker-less
development — is in SELF_HOSTING.md.
Dashboard at http://localhost:3000, API at http://localhost:3001.
License
Code is licensed under AGPL-3.0. SDKs ship separately under MIT
(npm/PyPI package: millionsend).
The MillionSend name, wordmark, and logos are trademarks of the MillionSend project and are not licensed under the AGPL.
Community
Questions, ideas and roadmap talk live in the Discussions.