How to Send Emails with Node.js for Free in 2025

Sending emails with Node.js doesn't have to be expensive. In 2025, there are several powerful options for developers to send transactional emails, OTPs, and notifications without breaking the bank.

1. Using a REST API (Recommended)

Modern email services like Risu Mail provide a clean REST API. This is usually faster and more reliable than traditional SMTP because it handles retries and connection pooling on the server side.

const response = await fetch('https://api.risumail.com/api/v1/emails', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    to: 'user@example.com',
    subject: 'Welcome to Risu!',
    html: '<h1>Hello!</h1>'
  })
});

2. Using SMTP Relay

If you are using a library like Nodemailer, you can use an SMTP relay. Simply provide the host, port, and credentials provided by your mail service.

Conclusion

For most Node.js applications, starting with a REST API like Risu Mail is the most efficient path. It provides high deliverability and easy debugging tools right out of the box.