I used nodemailer and my code is:
const nodemailer = require('nodemailer');

module.exports = function(obj) {
    return new Promise((resolve, reject) => {
        console.log('In root to mail send file...');
        let transporter = nodemailer.createTransport({
            service: 'gmail',
            auth: {
                user: 'myemail@gmail.com',
                pass: 'my password'
            }
        });
        let mailOptions = {
            from: '<myemail@gmail.com>', // sender address
            to: obj.email, // list of receivers
            subject: obj.subject, // Subject line
            text: obj.msg, // plain text body
            html: obj.html_msg // html body
        };
        console.log('sending function');
        transporter.sendMail(mailOptions, (error, info) => {
            if (error) {
                console.log('Error due to send mail' + error);
                reject(error);
            } else {
                console.log('Message %s sent: %s', info.messageId, info.response);
                resolve(info);
            }
        });
    });
}

when I run this code, I got this error
{ Error: connect ETIMEDOUT 74.125.200.109:465     at Object.exports._errnoException (util.js:1022:11)     at `enter code here`exports._exceptionWithHostPort (util.js:1045:20)     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1090:14)   code: 'ECONNECTION',   errno: 'ETIMEDOUT',   syscall: 'connect',   address: '74.125.200.109',   port: 465,   command: 'CONN' }