Nodemailer电子邮件发送在Node.js中不起作用

我尝试使用Node.js Nodemailer发送电子邮件，但无法正常工作。我不知道如何正确设置它。我使用了下面的代码，但是它不起作用，并且出现错误。我是Nodemailer的新手，所以我无法找出错误。

允许安全性较低的应用：开启

我需要通过Google帐户做什么？请帮助任何人找到解决方案。

app.js：

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

const app = express();

// View engine setup
app.engine('handlebars', exphbs());
app.set('view engine', 'handlebars');

// Static folder
app.use('/public', express.static(path.join(__dirname, 'public')));

// Body Parser Middleware
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.engine('handlebars', exphbs({
    defaultLayout: false,
}));

//app.locals.layout = false;
 
app.get('/', (req, res) => {
    res.render('contact');
});

app.post('/send', (req, res) => {
    const output = `
    <p>You have a new contact request</p>
    <h3>Contact Details</h3>
    <ul>  
      <li>Name: ${req.body.name}</li>
      <li>Company: ${req.body.company}</li>
      <li>Email: ${req.body.email}</li>
      <li>Phone: ${req.body.phone}</li>
    </ul>
    <h3>Message</h3>
    <p>${req.body.message}</p>
  `;

    // create reusable transporter object using the default SMTP transport
    let transporter = nodemailer.createTransport({
        host: 'mail.madepartooty.com',
        port: 587,
        secure: false, // true for 465, false for other ports
        auth: {
            user: '[email protected]', // generated ethereal user
            pass: 'test123' // generated ethereal password
        },
        tls: {
            rejectUnauthorized: false
        }
    });

    // setup email data with unicode symbols
    let mailOptions = {
        from: '"Nodemailer Contact" <[email protected]>', // sender address
        to: '[email protected]', // list of receivers
        subject: 'Node Contact Request', // Subject line
        text: 'Hello world?', // plain text body
        html: output // html 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));
        res.render('contact', { msg: 'Email has been sent' });
    });
});

app.listen(3000, () => console.log('Server started...'));

错误：

Error: connect ETIMEDOUT 157.245.154.37:587
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16) {
  errno: 'ETIMEDOUT',
  code: 'ECONNECTION',
  syscall: 'connect',
  address: '157.245.154.37',
  port: 587,
  command: 'CONN'
}