Plunk

Open-source email platform — transactional + marketing, self-hostable.

Visit Plunk Start free with MailKite

How MailKite fits

Plunk is self-host OSS. MailKite is managed inbound-first infra — no server to run.

Send email from Plunk with MailKite

A minimal, copy-paste starter. Swap in your own domain and API key.

send.ts

import { MailKiteClient } from "@mailkite/client";

// One API, your own DKIM-signed domain — no mail server to run
const mailkite = new MailKiteClient({ token: process.env.MK_API_KEY! });

await mailkite.send({
  from: "you@yourdomain.com",        // any address on a verified domain
  to: "user@example.com",
  subject: "Hello from Plunk",
  html: "<p>Sent in milliseconds via MailKite.</p>",
});

Read the sending quickstart

Plunk is an open-source email platform combining transactional sending, marketing campaigns, and workflow automation. Self-host it (AGPL, Docker) or use the managed cloud ($0.001/email).