Mailtrap

Email testing sandbox plus a sending API — catch mail before production.

How MailKite fits

Testing workflows? MailKite's webhook replay and per-route testing cover live inbound QA; pair with Mailtrap for sandbox send previews.

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

Read the sending quickstart

Mailtrap is an email testing platform: a sandbox that captures emails sent from staging/dev so they never reach real recipients, plus HTML inspection, spam scoring, and a separate sending API for production. It's a staple of QA workflows for teams that want to preview and debug email safely.

Key features

Sandbox inboxes that capture test email
HTML inspector and spam-score checks
Forwarding rules for staging environments
Separate transactional send API

Pricing model

Free tier + tiered plans

Questions about Mailtrap

What is Mailtrap used for?

Capturing and inspecting emails sent from non-production environments so they don't reach real users, plus checking HTML and spam score before sending.

Does MailKite have a testing sandbox?

MailKite focuses on live inbound QA (one-click webhook replay, per-address test routes). For staging send previews, a tool like Mailtrap pairs well.