Resend

Developer-first transactional email API for React, Node, and friends.

Visit Resend Start free with MailKite

How MailKite fits

Comparing Resend? See the head-to-head: inbound-first JSON, unlimited free domains, and an MCP server for agents.

See the full MailKite vs Resend comparison

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

Read the sending quickstart

Resend is a developer-first transactional email API known for a clean SDK, a React email templating story, and fast onboarding. It started send-only and has since added inbound, making it a full platform. The DX and documentation are its calling card.

Key features

REST + SDK send with React email templates
Inbound email (newer) with webhooks
Per-domain DKIM/SPF setup with a guided dashboard
Generous free tier for low-volume sending

Pricing model

Free tier + usage-based

Questions about Resend

Does Resend support inbound email?

Yes — Resend added inbound email with webhooks. It started as a send-only API, so inbound is newer than its outbound surface.

How is MailKite different from Resend?

MailKite was built inbound-first (clean JSON webhooks with threading and auth verdicts from day one), charges nothing per domain, and ships a hosted MCP server for AI agents. See the full comparison at /alternatives/resend.

Is Resend free?

Resend has a free tier for low-volume sending. Check their pricing page for current limits.