Drop-in SMTP relay with modern cloud deliverability and unified REST webhook telemetry

import nodemailer from 'nodemailer';

const transporter = nodemailer.createTransport({
  host: 'smtp.sadasend.com',
  port: 587,
  secure: false, // STARTTLS
  auth: {
    user: 'apikey', // Universal SendGrid-compatible username
    pass: process.env.SADASEND_API_KEY,
  },
});

export async function sendViaSmtp(to: string) {
  const info = await transporter.sendMail({
    from: '"Billing" <billing@yourdomain.com>',
    to,
    subject: 'Monthly Payment Received',
    html: '<p>Your subscription is active.</p>',
  });

  console.log('SMTP message sent:', info.messageId);
  return info;
}