{
  "html_body": [],
  "text_body": [],
  "attachments": [],
  "parts": [
    {
      "headers": [
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "multipart",
              "c_subtype": "mixed",
              "attributes": [
                [
                  "boundary",
                  ":foo"
                ]
              ]
            }
          },
          "offset_field": 0,
          "offset_start": 13,
          "offset_end": 48
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Multipart": []
      },
      "offset_header": 0,
      "offset_body": 50,
      "offset_end": 169
    }
  ]
}