使用 Firebase Cloud Functions 时 Nodemailer 查询 EREFUSED localhost

Question

每当 Firebase 数据库中创建新订单时，我都会尝试向管理员帐户发送电子邮件。我为此使用 Cloud Functions 和 Nodemailer，但出现以下错误：

错误：queryA EREFUSED localhost at QueryReqWrap.onresolve [as oncomplete] (dns.js:213:19)

这是代码：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const nodemailer = require('nodemailer');
admin.initializeApp();

/**
* Here we're using Gmail to send 
*/
let transporter = nodemailer.createTransport({
    service: 'smtp.gmail.com',
    port: 465,
    secure: true,
    auth: {
        user: 'myemail@gmail.com',
        pass: 'mypass'
    }
});

exports.sendMail = functions.database.ref('/Order/{orderId}').onCreate((snapshot, context) =>{
    const dest = 'destination@gmail.com';

    const mailOptions = {
        from: 'Risal Fajar <noreply@bukakata.com>',
        to: dest,
        subject: 'I\'M A PICKLE!!!',
        html: `<p style="font-size: 16px;">Pickle Riiiiiiiiiiiiiiiick!!</p>
            <br />
            <img src="https://images.prod.meredith.com/product/fc8754735c8a9b4aebb786278e7265a5/1538025388228/l/rick-and-morty-pickle-rick-sticker" />
        `
    };

    // returning result
    return transporter.sendMail(mailOptions).then(() => {
        console.log('Mail sent to ', dest);
    });
});

我不知道为什么错误显示localhost，即使我输入了smtp.gmail.com

编辑：我添加了transport.verify()，这就是结果

{ 错误：queryA EREFUSED localhost at QueryReqWrap.onresolve [as oncomplete] (dns.js:213:19) errno: 'EREFUSED'，代码：'EDNS'，系统调用：'queryA'，主机名：'localhost'，命令：'康恩'}

Answer 1

修复

我通过将传输器配置（更改服务名称）更改为：

let transporter = nodemailer.createTransport({
    service: 'gmail',
    port: 465,
    secure: true,
    auth: {
        user: 'myemail@gmail.com',
        pass: 'mypass'
    }
});