Javascript 如何在claudia api builder中使用NodeEmailr

我正在尝试创建一个简单的RESTAPI，我可以向其发送电子邮件，然后自己发送电子邮件。我正在使用nodemailer，并已将其设置为一个express应用程序，它工作正常，确认我的身份验证等工作正常。我想在线托管它，所以我使用claudia.js创建了lambda和API网关设置，但这似乎破坏了它

代码

const nodemailer = require('nodemailer');
const secrets = require('./secret');
const apiBuilder = require('claudia-api-builder');

api = new apiBuilder();
module.exports = api;

var mailOptions;
var logMsg = "none";

api.post('/email', async (req, res) => {
  mailOptions = {
    from: secrets.email,
    to: secrets.email,
    subject: 'Email From: ' + req.body.senderEmail + ' | ' + req.body.subject,
    text: req.body.content,
  };
  sendMail(mailOptions);
  return logMsg;
})

const transporter = nodemailer.createTransport({
  service: 'gmail',
  auth: {
    user: secrets.email,
    pass: secrets.pwd
  }
});

function sendMail(mailOptions) {
  logMsg="Starting Send Function";
  transporter.sendMail(mailOptions, function (error, info) {
    if (error) {
      logMsg = error;
      return error;
    } else {
      logMsg = "Send Complete";
      return true;
    }
  });
  logMsg="Function finished";
}

当我通过postman调试时，通过发布原始JSON

{
    "senderEmail": "test2",
    "subject": "test",
    "content":"test"
}

---

我收到了“函数已完成”的消息，但我并不认为这是可能的，因为肯定if或else应该在

transporter.sendMail（…

）下启动，从函数返回。我也没有收到作为我最终目标的电子邮件，直到我开始返回transporter时，我才遇到了同样的问题

return transporter.sendMail(mailOptions)
  .then(info => {
    console.log('email sent: ', info)
    return {'status': 'OK'}
  })
  .catch(err => {
    console.log('email error: ', err)
    return {'status': 'ERROR'}
  })