Cloudflare Workers

Overview

This guide explains how to integrate Mailtrap with Cloudflare Workers to send emails programmatically using the Mailtrap Email API.

Prerequisites

Before you start, make sure you have:

• Verified your sending domain

• Created and saved an API key

Send emails using Cloudflare Workers and Mailtrap

To integrate Mailtrap and send emails via Cloudflare Workers, copy and paste the following script into your worker configuration:

cloudflare-worker-mailtrap.ts

export default {
  async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
    try {
      const response = await fetch("https://send.api.mailtrap.io/api/send", {
        method: "POST",
        headers: {
          "Authorization": "Bearer YOUR-MAILTRAP-API-KEY-HERE",
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          from: { name: 'Mailtrap Test', email: 'YOUR-EMAIL-HERE' },
          to: [{ email: 'RECIPIENT-EMAIL-HERE' }],
          subject: 'Hello World',
          html: '<strong>it works!</strong>',
        }),
      });

      const data = await response.json();

      return new Response(JSON.stringify(data), {
        headers: {
          'Content-Type': 'application/json',
        },
      });
    } catch (error) {
      return new Response(JSON.stringify({
        error: error instanceof Error ? error.message : 'Unknown error'
      }), {
        status: 400,
        headers: { 'Content-Type': 'application/json' },
      });
    }
  },
};

Configuration

Once you copy the script, update the following fields with your information:

• Replace YOUR-MAILTRAP-API-KEY-HERE in the Authorization header with your actual API token as a Bearer token

• Replace YOUR-EMAIL-HERE with your verified sender email

• Replace RECIPIENT-EMAIL-HERE with the recipient's email address

Learn more

For additional details about the Email API, refer to the Mailtrap Email Sending API Integration guide.