# inbox.email.received

::::callout{intent="warning"}
Inboxes are currently in private beta and only available to a limited
number of users. The response shape might change before GA.

[Get early access](https://resend.com/help?type=report\&message=I+would+like+early+access+to+Inboxes.\&priority=low) if you're interested in testing this feature.

Once you have access, upgrade your Resend SDK to use the new methods:

:::code-group
```bash Node.js
npm install resend@6.28.1-preview-inboxes.2
```

```bash CLI
npm install -g resend-cli@2.22.0-preview-inboxes.2
```
:::
::::

Event triggered whenever an **inbound email is added to a thread**.

_Note: `source` is always `system`, because the email pipeline sends this event, even when the API or an agent sent the email._

## Response Body Parameters

All webhook payloads follow a consistent top-level structure with
event-specific data nested within the `data` object.

- `type` (string) — The event type that triggered the webhook (e.g., `inbox.email.received`).

- `created_at` (string) — ISO 8601 timestamp when the webhook event was created.

- `data` (object) — Event-specific data containing detailed information about the event. The data object for the `inbox.email.received` event contains the following parameters:

  :::::accordion{title="object parameters"}
  - `source` (api | dashboard | agent | system) — What made the change

  - `inbox_id` (string) — The ID of the inbox

  - `thread_id` (string) — The ID of the thread

  - `email_id` (string) — The ID of the email

  - `thread` (object) — The thread, as it is when the webhook is sent

    :::accordion{title="thread object"}
    - `object` (string) — Always `inbox_thread`

    - `id` (string) — The ID of the thread

    - `subject` (string | null) — The subject of the thread

    - `folder` (inbox | archive | spam | sent | trash) — The folder the thread lives in

    - `labels` (array) — The labels attached to the thread, each with an `id`, `name`, and `color`

    - `read` (boolean) — True only when every message in the thread is read
    :::

  - `email` (object) — The email, as it is when the webhook is sent, without `html` or `text`. Fetch the body from the API

    ::::accordion{title="email object"}
    - `id` (string) — The ID of the email

    - `direction` (inbound | outbound) — Whether the email was received by the inbox or sent from it

    - `from` (string) — Sender email address

    - `to` (string\[]) — The recipients of the email

    - `cc` (string\[]) — The CC recipients of the email

    - `bcc` (string\[]) — The BCC recipients of the email

    - `reply_to` (string\[]) — The Reply-To addresses

    - `subject` (string | null) — The subject of the email

    - `message_id` (string | null) — The Message-ID header of the email

    - `attachments` (array) — The attachments on the email

      :::accordion{title="attachment object"}
      - `id` (string) — The ID of the attachment

      - `filename` (string | null) — The filename of the attachment

      - `size` (number | null) — The size of the attachment in bytes
      :::

    - `read` (boolean) — Whether the email has been read

    - `received_at` (string) — ISO 8601 timestamp when the email arrived or was sent
    ::::
  :::::

:::code-group
```json
{
  "type": "inbox.email.received",
  "created_at": "2026-09-29T12:00:00.000Z",
  "data": {
    "source": "system",
    "inbox_id": "b3e2b2b6-3f0e-4c8e-9ad3-2f43a1e2c7f1",
    "thread_id": "7c1f0a2e-5d3b-4e8a-9f61-2b8d4c6e1a90",
    "email_id": "4ef9a417-02e9-4d39-ad75-9611e0fcc33c",
    "thread": {
      "object": "inbox_thread",
      "id": "7c1f0a2e-5d3b-4e8a-9f61-2b8d4c6e1a90",
      "subject": "Question about my invoice",
      "folder": "inbox",
      "labels": [],
      "read": false
    },
    "email": {
      "id": "4ef9a417-02e9-4d39-ad75-9611e0fcc33c",
      "direction": "inbound",
      "from": "Steve Wozniak <steve.wozniak@gmail.com>",
      "to": ["support@example.com"],
      "cc": [],
      "bcc": [],
      "reply_to": [],
      "subject": "Question about my invoice",
      "message_id": "<CAF7c1f0a2e5d3b@mail.gmail.com>",
      "attachments": [
        {
          "id": "2a0c9ce0-3112-4728-976e-47ddcd16a318",
          "filename": "invoice.pdf",
          "size": 48213
        }
      ],
      "read": false,
      "received_at": "2026-09-29T12:00:00.000Z"
    }
  }
}
```
:::

## Related pages

- [email.bounced](./learn-webhooks-emails-bounced.md)
- [email.clicked](./learn-webhooks-emails-clicked.md)
- [email.complained](./learn-webhooks-emails-complained.md)
- [email.delivered](./learn-webhooks-emails-delivered.md)
- [email.delivery_delayed](./learn-webhooks-emails-delivery-delayed.md)
- [email.failed](./learn-webhooks-emails-failed.md)
- [email.opened](./learn-webhooks-emails-opened.md)
- [email.received](./learn-webhooks-emails-received.md)
- [email.scheduled](./learn-webhooks-emails-scheduled.md)
- [email.sent](./learn-webhooks-emails-sent.md)

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