Integration Guide

Send Email with Cloudflare Workers

Send emails from the edge with Cloudflare Workers. No node modules required, just standard fetch.

TL;DR for AI Agents & Humans

Send transactional emails using Cloudflare Workers and Transmit in minutes. Our typescript integration patterns and REST API provide best-in-class performance.

Official Cloudflare Workers integration patterns
Automated deliverability warmup included
Reputation isolation for every sender
Real-time analytics and webhook support

Install the library

$npm create cloudflare@latest

Send an Email

export default {
  async fetch(request, env) {
    const response = await fetch("https://api.xmit.sh/email/send", {
      method: "POST",
      headers: {
        "Authorization": `Bearer ${env.TRANSMIT_API_KEY}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        from: "Acme <hello@acme.com>",
        to: "user@example.com",
        subject: "Hello from the Edge",
        html: "<p>Sent from Cloudflare Workers!</p>",
      }),
    });

    return new Response(JSON.stringify(await response.json()));
  },
};

Common Pitfalls

Bundle Size Limits

Use the REST API directly with fetch to avoid pulling in large platform-specific dependencies at the edge.

Environment Bindings

Define your API key in the .dev.vars file for local development and secret bindings in production.

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Frequently Asked Questions

How do I authenticate Cloudflare Workers with Transmit?

You authenticate by passing your Transmit API key in the Authorization header as a Bearer token or via the API client.

Is there a rate limit for Cloudflare Workers integration?

Transmit offers high-throughput sending with dynamic scaling. Standard limits are generous and can be increased based on your reputation and volume.