var transporter = nodemailer.createTransport(
  smtpTransport({
    service: 'Gmail',
    auth: {
      xoauth2: xoauth2.createXOAuth2Generator({
        user: 'pathareshekhar29@gmail.com',
        pass: 'XYZ'
      })
    }
  })
);

var mailOptions = {
  from: 'pathareshekhar29@gmail.com',
  to: user.empEmail,
  subject: 'User Account Approval',
  text: 'Demo Mail'
};

transporter.sendMail(mailOptions, function (err) {
  console.log('ygcasyhgbavsdbahvbdb   '+ err);
  if (err) {
    return res.status(500).send({ msg: err.message });
  } else {
    res.status(200).send('A verification email has been sent to ' + user.empEmail + '.');
  }
});