nodejs中nodemailer报错： 链接超时 510 connect ETIMEDOUT 127.0.0.1:456(已解决)

//cmd打印的错误
Error: connect ETIMEDOUT 127.0.0.1:456
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1128:14) {
  errno: 'ETIMEDOUT',
  code: 'ESOCKET',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 456,
  command: 'CONN'
}

我的代码

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

//创建邮件发布对象
let transporter = nodemailer.createTransport({
    host: 'smtp.qq.com',
    port: 456,
    secure: true,
    auth:{
        user:'a_ananiah@foxmail.com',
        pass:'muzshiiihtjfeadi'
    }
});

function send(maill,code){
    // 邮件信息
    let mailObj = {
        form: '"Fred Foo" <a_ananiah@foxmail.com>',
        to: maill,
        subject: "1902",
        text: `您的验证码是${code}，有效期是五分钟！`
    }
    //发送邮件 
    transporter.sendMail(mailObj,(err,data) => {
        console.log(err)
        console.log(data)
    })
}

错误原因：变量名大写的原因。变量名称改成小写就OK

let mailobj = { //此处变量名称改成小写就OK
        form: '"Fred Foo" <a_ananiah@foxmail.com>',
        to: maill,
        subject: "1902",
        text: `您的验证码是${code}，有效期是五分钟！`
    }
    //发送邮件 
    transporter.sendMail(mailobj,(err,data) => { //此处变量名称改成小写就OK
        console.log(err)
        console.log(data)
    })

PS:原谅Ananiah是个小白，各位谅解！