问Nodemailer只在生产中失败

EN

const nodemailer = require('nodemailer');

const user = process.env.EMAIL;
const pass = process.env.EMAIL_PASS;


const transporter = nodemailer.createTransport({
    service: 'kinghost',
    host: 'smtp.kinghost.net',
    port: 587,
    secure: false,
    pool: true,
    auth: { user, pass }
});

module.exports = {
    sendMail(to, subject, html) {
        const mailOptions = {
            from: user,
            to,
            subject,
            html
        };

        console.log(user)

        transporter.sendMail(mailOptions, (err, info) => {
            if (err) {
                console.log(err)
            };

            console.log(`Mail to ${mail} has been sended`);
        });
    }
};