testmail.app

End-to-end email testing via disposable addresses and an API.

Visit testmail.app Start free with MailKite

How MailKite fits

Testing sign-ups? With MailKite, route a catch-all address to a webhook and test against the JSON event directly.

Send email from testmail.app 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 testmail.app",
  html: "<p>Sent in milliseconds via MailKite.</p>",
});

Read the sending quickstart

testmail.app gives developers a shared inbox namespace with wildcard addresses and a JSON API, so end-to-end tests can send to a unique address and poll the API for the resulting email. It's a lightweight, developer-friendly choice for automating sign-up and verification flows.