{
  "message_id": "18f4a9d7c2",
  "from": "supplier@example.ru",
  "subject": "Счет и акт за май",
  "date": "2026-05-30T09:15:00Z",
  "attachments": [
    { "filename": "invoice-10492.pdf", "mimeType": "application/pdf", "size": 184920 },
    { "filename": "act-10492.pdf", "mimeType": "application/pdf", "size": 122400 }
  ],
  "folder": "suppliers"
}