Server response: 550 5.7.1 Unauthenticated email from guest.com is not
accepted due to domain's 5.7.1 DMARC policy. Please contact the administrator
of guest.com domain if 5.7.1 this was a legitimate mail. Please visit 5.7.1
https://support.google.com/mail/answer/2451690 to learn about the 5.7.1 DMARC
initiative. s12-v6si3013316qtg.362 - gsmtp

const express = require('express');
const nodemailer = require('nodemailer');
const path = require('path');
const bodyParser = require('body-parser');


const app = express();

const port = 3000;

app.use(bodyParser.json());

app.use(express.static(path.join(__dirname, 'dist')));

app.post('/email', (req, res) => {
  let transporter = nodemailer.createTransport({
          host: 'smtp.mailgun.org',
          port: 587,
          secure: false, // true for 465, false for other ports
          auth: {
              user: 'postmaster@sandboxc8f2ecf64f364ca6ad740e658485c557.mailgun.org',
              pass: 'my API key here'
          },
          tls: {
            rejectUnauthorized: false
          }
      });

      // setup email data with unicode symbols
      let mailOptions = {
          from: req.body.from, // sender address
          to: 'cu0ngpitt@gmail.com', // list of receivers
          subject: 'Someone wrote you from your Online Resume!', // Subject line
          text: req.body.messge, // plain text 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));
      });
});

app.get('/', (req, res) => {
  res.send('Hello world');
});

app.listen(port, () => {
  console.log('Server running on port ' + port);
})