A recipient complained
Sent to your endpoint for message.complaint. Respond with a 2xx within 10 seconds; timeouts and non-2xx responses are retried on a backoff (7 attempts in total over about 21 hours). Redirects are not followed.
postWebhookmessage.complaint
Headers
X-SuperMail-Event'message.complaint' required
X-SuperMail-Deliverystring required
X-SuperMail-Timestampstring required
Unix seconds.
X-SuperMail-Signaturestring required
t=<unix>,v1=<hex HMAC-SHA256(secret, "<t>.<raw body>")>
Payload
Response
Acknowledged.
Changes
Webhooks have no change history: a webhook is keyed by its event name rather than a path and method, so no recorded change can name it.