Nodemailer - 弃用警告：“punycode”模块已弃用

问：

我需要创建一个脚本，每天使用 gmail 帐户发送一次邮件。我使用了nodemailer，我有这个简单的测试代码

const fs = require('fs');
const path = require('path');
const nodemailer = require('nodemailer');

const transport = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    //secure: true,
    //port: 465,
    auth: {
        user: '[email protected]',
        pass: 'mypassword'
    }
})

let mailOptions = {
    from: '[email protected]', // sender address
    to: '[email protected]', // list of receivers
    subject: 'Test email', // Subject line
    text: 'this is some text', //, // plaintext body
    html: '<b>Hello world </b>' // You can choose to send an HTML body instead
}

transport.sendMail(mailOptions, (error, info) => {
    if( error ) {
        return false;
    } else {
        console.log('Message sent: ' + info.response);
        return true;
    };
});

我注意到，当我尝试使用运行时，我总是会遇到此错误node index.js

(node:20496) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)

代码是否有任何问题，或者是 nodemailer 错误？还有其他选择吗？