test.js

const nodemailer = require('nodemailer');

async function main() {
  let transport = nodemailer.createTransport({
    host: 'sandbox.smtp.mailtrap.io',
    port: 2525,
    auth: {
      user: 'c23ad3a8e5cc00',
      pass: '9e6d862445fbc4'
    }
  });

  let info = await transport.sendMail({
    from: '"Fred Foo 👻" <foo@example.com>', // sender address
    to: 'bar@example.com, baz@example.com', // list of receivers
    subject: 'Hello ✔', // Subject line
    text: 'Hello world?', // plain text body
    html: '<b>Hello world?</b>' // html body
  });
  console.log('Message sent: %s', info.messageId);
  console.log('Preview URL: %s', nodemailer.getTestMessageUrl(info));
}

main().catch(console.error);