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Event triggered whenever the recipient opened the email.
Open rates are not always accurate. Learn more about why open rates may not be accurate.

Response Body Parameters

All webhook payloads follow a consistent top-level structure with event-specific data nested within the data object.
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type
string
The event type that triggered the webhook (e.g., email.opened).
​
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 email.opened event contains the following parameters:
{
  "type": "email.opened",
  "created_at": "2024-02-22T23:41:12.126Z",
  "data": {
    "broadcast_id": "8b146471-e88e-4322-86af-016cd36fd216",
    "created_at": "2024-02-22T23:41:11.894719+00:00",
    "email_id": "56761188-7520-42d8-8898-ff6fc54ce618",
    "from": "Acme <onboarding@resend.dev>",
    "to": ["delivered@resend.dev"],
    "subject": "Sending this example",
    "template_id": "43f68331-0622-4e15-8202-246a0388854b",
    "tags": {
      "category": "confirm_email"
    }
  }
}