How can I track delivery status of mail

Hey, I can able to send emails using gmail.
```
const result = await gmail.users.messages.send({
userId: "me",
requestBody: {
raw: rawMessage,
},
});

// result object has threadId.
```
And able to get the thread id from result,
Suppose the receipt email address is not exist. so the email will be undelivered/bounced. how can I track delivery status with my thread Id which I got from result object.