{
  "id": 4,
  "from": "hr@company.com",
  "subject": "Updated Employee Handbook",
  "date": "2026-03-04T11:00:00Z",
  "attachments": [
    {"filename": "employee_handbook_2026.pdf", "size_bytes": 3400000, "content_type": "application/pdf"}
  ]
}
