Test the edge cases.
Before your users find them.

const response = await fetch(
  process.env.ZAPSMTP_API_URL, {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer zap_your_api_key',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    from: 'hello@yourdomain.com',
    to: ['delivered@simulator.zapsmtp.xyz'],
    subject: 'You’re all set.',
    html: '<p>Your next big thing starts here.</p>'
  })
});