Postal

Self-hosted transactional mail server (send-focused).

How MailKite fits

Postal is a self-hosted send server. MailKite is managed send + receive on Cloudflare's network — no server to operate.

Receive email into Postal via MailKite

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

webhook.ts

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

// MailKite POSTs every inbound email at your domain as JSON.
// Point a route at this handler in the MailKite dashboard.
export default async function handler(req: Request) {
  const raw = await req.text();
  const sig = req.headers.get("x-mailkite-signature") ?? "";

  // Reject anything not signed by your webhook secret
  const ok = await verifyWebhook(sig, raw, process.env.MK_WEBHOOK_SECRET!);
  if (!ok) return new Response("bad signature", { status: 401 });

  const email = JSON.parse(raw);
  // Route into Postal: open a ticket, create a task, store a record
  await routeIntoName(email);   // email.from · email.subject · email.text

  return new Response(JSON.stringify({ ok: true }));
}

Read the inbound webhooks guide

Postal is an open-source mail server designed for transactional sending that you self-host. It offers an HTTP API, webhooks, and per-organization sending, aimed at teams that want to own their sending infrastructure rather than use a managed service. Operation and deliverability are on you.