Send Emails With NodeJS

'use strict';
const nodemailer = require('nodemailer');

// Generate test SMTP service account from ethereal.email
// Only needed if you don't have a real mail account for testing
nodemailer.createTestAccount((err, account) => {

    // Explained as 3 steps process as I explaned in tutorial

    //Step: 1 Create transporter
    let smtpConfig = {
        host: 'smtp.ethereal.email',
        port: 587,
        secure: false, // true for 465, false for other ports. For TLS use port 465
        auth: {
            user: account.user, // generated ethereal user
            pass: account.pass // generated ethereal password
        }
    };

    let transporter = nodemailer.createTransport(smtpConfig);

    //Step: 2 Setup message options
    let mailOptions = {
        from: '"Fred Foo ??" <[email protected]>', // sender address
        to: '[email protected], [email protected]', // list of receivers i.e [sneder1, sender2, sender3, ....]
        subject: 'Hello ?', // Subject line
        text: 'Hello world?', // plain text body
        html: '<b>Hello world?</b>' // html body
    };

    //Step: 3 Send mail using created transport
    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));

        // Message sent: <[email protected]>
        // Preview URL: https://ethereal.email/message/WaQKMgKddxQDoou...
    });
});

var nodemailer = require('nodemailer');
var tarnsporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: 'your gmail address',
        pass: 'your gmail password'
    }
});

var mailOptions = {
    from: '[email protected]', // sender address
    to: '[email protected]', // list of receivers
    subject: 'Hello', // Subject line
    text: 'Hello world ?', // plain text body
    html: '<b>Hello world ?</b>' // html body
};

tarnsporter.sendMail(mailOptions, function (err, info) {
    if (err) {
        console.log('error : ' + err);
        return;
    }
    console.log('mail sent successfully');
});

var nodemailer = require('nodemailer');

var transporter = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    port: 465,
    secure: true,
    auth: {
        type: 'OAuth2',
        clientId: 'YOUR_GMAIL_ACCOUNT_CLIENT_ID',
        clientSecret: 'YOUR_GMAIL_ACCOUNT_CLIENT_SECRET'
    }
});


var mailOptions = {
    from: '[email protected]', // sender address
    to: '[email protected]', // list of receivers
    subject: 'Hello', // Subject line
    text: 'Hello world ?', // plain text body
    html: '<b>Hello world ?</b>', // https://drive.google.com/open?id=1NXO7RZFijpRBNTGLHWJ_ITlweT7gHRdphtml body
    auth: {
        user: '[email protected]',
        refreshToken: 'YOUR_GMAIL_ACCOUNT_REFRESH_TOKEN',
        accessToken: 'YOUR_GMAIL_ACCOUNT_ACCESS_TOKEN'
    }
};

transporter.sendMail(mailOptions, function (err, info) {
    if (err) {
        console.log('error : ' + err);
        return;
    }
    console.log('mail sent successfully');
});