email.opened

When it triggers

This event fires when the recipient opens the email. Open tracking works by embedding a tracking pixel in the email HTML.

Open tracking is not 100% accurate. Some email clients block tracking pixels or pre-load images, which can affect results.

Payload

{
  "type": "email.opened",
  "data": {
    "email_id": "em_abc123",
    "from": "hello@yourdomain.com",
    "to": "user@example.com",
    "subject": "Welcome to SendKit",
    "tags": [],
    "created_at": "2026-03-02T12:05:00+00:00"
  },
  "created_at": "2026-03-02T12:05:00+00:00"
}

Payload fields

string

Unique identifier of the email.

string

Sender email address.

string

Recipient email address.

string

Email subject line.

array

Tags associated with the email. Each tag has name and value string fields. Returns an empty array if no tags were set.

string

ISO 8601 timestamp of when the email was created.

Getting Started

Emails

Contacts

When it triggers

Payload

Payload fields

​When it triggers

​Payload

​Payload fields

When it triggers

Payload

Payload fields