{
  "id": "16-unknown-format",
  "category": "abnormal",
  "from": "random@example.com",
  "subject": "Weekly newsletter",
  "text": "Hello, this is a marketing newsletter about office snacks.",
  "messageId": "<16-unknown-format@fixtures.local>",
  "date": "2026-04-14T14:00:00.000Z",
  "attachments": []
}