CloudMailin

Inbound email to HTTP POST — a dependable decade-old inbound parser.

Visit CloudMailin Start free with MailKite

How MailKite fits

Comparing CloudMailin? MailKite does the same inbound-to-JSON job with sending built in and no per-domain fees.

See the full MailKite vs CloudMailin comparison

Receive email into CloudMailin 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 CloudMailin: 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

CloudMailin is an inbound-focused service that turns incoming email into an HTTP POST, a job it has done reliably for over a decade. It's a solid choice if all you need is a battle-tested inbound parser, though sending is a separate concern and the payload format predates modern JSON conventions.

Key features

Inbound email → HTTP POST (its core product)
Multiple payload formats (JSON, multipart, raw)
Long-running, dependable inbound infrastructure
Per-address routing

Pricing model

Volume/address-based

Questions about CloudMailin

Does CloudMailin send email?

CloudMailin is inbound-focused; sending is not its core product.

CloudMailin vs MailKite?

Both do inbound-to-webhook. MailKite adds a first-class send API, modern parsed JSON, unlimited free domains, and an MCP server. See /alternatives/cloudmailin.