{ "event": "<unknown>", "data": { "messageId": "<string>", "complainedAt": "<string>", "recipients": [ "<string>" ], "emailId": "<string>", "complaintFeedbackType": "<string>", "userAgent": "<string>", "feedbackId": "<string>" }, "attempt": 123, "timestamp": 123 }
Fired when a recipient marks as spam.
Unix timestamp used for signature
HMAC SHA-256 signature of "timestamp.body" using your webhook secret, prefixed with sha256=
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