Introduction - SendKit

Webhooks allow your application to receive real-time HTTP notifications when events occur in SendKit. Instead of polling the API, SendKit pushes event data to your endpoint as it happens.

How it works

Provide an HTTPS URL where SendKit will send event notifications.

Choose your events

Subscribe to specific events (e.g. email.delivered) or use the wildcard * to receive all events.

Receive and verify

SendKit sends a POST request with a JSON payload and an HMAC-SHA256 signature for verification.

Payload format

Every webhook delivery is a POST request with a JSON body:

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

Available events

SendKit supports two categories of events:

Category	Events
Email	`email.sent`, `email.delivered`, `email.bounced`, `email.complained`, `email.opened`, `email.clicked`, `email.rejected`, `email.failed`, `email.delivery_delayed`
Contact	`contact.created`, `contact.updated`, `contact.deleted`

Event reference

See the full list of events with payload examples.

Event Types

​How it works

​Payload format

​Available events

Event reference

How it works

Payload format

Available events