UnhandledPromiseRejectionWarning：错误：无效的登录：535身份验证失败：用户名/密码错误

Question

我正在通过nodemailer发送电子邮件，如果没有发送电子邮件，我正在使用sequelize事务回滚上述任务，我在拒绝Promise或抛出错误时遇到了错误。 请帮忙。

//Transaction 
await db.sequelize.transaction(async t => {
    const facility = await db.Facility.create(body, {transaction: t});
    const user = await userCmp.addUser(email.email, t); // add user
    await facilityUserCmp.addFacilityUser(facility.id, user.id, t); // add facility_user
    emailCmp.verification(user, t); // notify user

    if (user) {
        res.status(201).send({
            success: true,
            errors: [],
            data: facility
        });
    }
});

emailCmp.verification（user，t）; //这是发送电子邮件的功能。

发送电子邮件代码。

verification: (user, t) => {
    try {
        const smtpTransport = nodemailer.createTransport({
            service: 'SendGrid',
            auth: {
                user: 'wrong username',
                pass: 'wrong password'
            }
        });
        const mailOptions = {
            to: 'test email',
            from: 'test email',
            subject: 'test subject',
            text: 'Testing email'
        };
        smtpTransport.sendMail(mailOptions)
                .then((success) => {
                    console.log(success);
                }).catch((e) => {
                    throw new Error(e);
                });
    } catch (e) {
           console.log("inside catch -p---------------");
       }

例外：

(node:10492) UnhandledPromiseRejectionWarning: Error: Invalid login: 535 Authentication failed: Bad username / password
at SMTPConnection._formatError (C:\Users\******\*****\node_modules\nodemailer\lib\smtp-connection\index.js:606:19)
at SMTPConnection._actionAUTHComplete (C:\Users\******\*****\node_modules\nodemailer\lib\smtp-connection\index.js:1335:34)
at SMTPConnection._responseActions.push.str (C:\Users\******\*****\node_modules\nodemailer\lib\smtp-connection\index.js:366:26)
at SMTPConnection._processResponse (C:\Users\******\*****\node_modules\nodemailer\lib\smtp-connection\index.js:762:20)
at SMTPConnection._onData (C:\Users\******\*****\node_modules\nodemailer\lib\smtp-connection\index.js:558:14)
at TLSSocket._socket.on.chunk (C:\Users\******\*****\node_modules\nodemailer\lib\smtp-connection\index.js:709:51)
at TLSSocket.emit (events.js:182:13)
at addChunk (_stream_readable.js:283:12)
at readableAddChunk (_stream_readable.js:264:11)
at TLSSocket.Readable.push (_stream_readable.js:219:10)
at TLSWrap.onread (net.js:638:20)
(node:10492) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:10492) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

请帮帮我。