1. The Nodemailer module makes it easy to send emails from the nodejs application
2. Install using the command, npm install nodemailer

  var nodemailer = require('nodemailer');
var transporter = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: 'test@test.com',
    pass: 'password'
  }
});
var config = {
  from: 'test@test.com',
  to: 'test2@test.com',
  subject: 'Test mail from sendmailer',
  text: 'Hello world!'
};
transporter.sendMail(config, function(error, info){
  if (error) {
    console.log(error);
  } else {
    console.log('Email sent');
  }
});