{
  "type": "message.failed",
  "webhook_id": "abe11757-2886-4b55-96f1-0e0afc95795a",
  "timestamp": "2024-05-06T09:55:16.687031577Z",
  "data": {
    "account_id": "4cdd7bdd-294e-4762-892f-83d40abf5a87",
    "event": "on_failed",
    "from": "sender@example.com",
    "recipient": "invalid@nonexistent-domain.com",
    "subject": "Welcome to our service",
    "message_id_header": "<message-id-12345@localhost>",
    "id": "407926766d2711f09b30960002cafe7c"
  }
}