app.post('/', (req, res) => {
  const output = `
    <p>You have a new contact request</p>
    <h3>Contact Details</h3>
    <ul>
      <li>Name: ${req.body.name}</li>
      <li>Email: ${req.body.mail}</li>
      <li>Subject: ${req.body.subject}</li>
    </ul>
    <h3>Message</h3>
    <p>${req.body.message}</p>
  `;

  // create reusable transporter object using the default SMTP transport
  var nodemailer = require('nodemailer');

  var transporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
      user: 'portfolio.message@gmail.com',
      pass: 'jelsingrad95'
    }
  });

  // setup email data with unicode symbols
  let mailOptions = {
    from: '"Nodemailer Contact" <portfolio.message@gmail.com>', // sender address
    to: 'ponjavusic.srdjan@gmail.com', // list of receivers
    subject: 'Portfolio Message', // Subject line
    text: 'Hello world?', // plain text body
    html: output // html body
  };

  // send mail with defined transport object
  transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
      return console.log(error);
    }
    console.log('Message sent: %s', info.messageId);
    console.log('Preview URL: %s', nodemailer.getTestMessageUrl(info));

    res.render('thankYou', { msg: req.body.name });
  });
});