The custom email provider engineered for Auth0 by Okta with sovereign European delivery

/**
 * Auth0 Post-User Registration Action
 * Triggers custom onboarding and verification dispatch via SadaSend
 *
 * @param {Event} event - Details about the newly registered user
 * @param {PostUserRegistrationAPI} api - Methods for managing identity
 */
exports.onExecutePostUserRegistration = async (event, api) => {
  const SADASEND_API_KEY = event.secrets.SADASEND_API_KEY;

  // 1. Dispatch custom welcome sequence via SadaSend REST API
  const response = await fetch('https://api.sadasend.com/emails', {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${SADASEND_API_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      from: 'security@yourdomain.com',
      to: event.user.email,
      subject: 'Welcome to your account',
      html: `<h3>Welcome, ${event.user.name || 'there'}!</h3><p>Your identity is verified.</p>`,
      tags: ['auth0', 'post-registration'],
      verifyBeforeSend: true, // In-flight pre-send check
    }),
  });

  if (!response.ok) {
    console.error('Failed to dispatch welcome email via SadaSend:', await response.text());
  }
};