Content-Type: multipart/mixed; boundary="1234567890123456789012345678901234567890123456789012345678901234567890123456789012"

--1234567890123456789012345678901234567890123456789012345678901234567890123456789012
Content-Type: multipart/mixed; boundary="123456789012345678901234567890123456789012345678901234567890123456789012345678901"

--123456789012345678901234567890123456789012345678901234567890123456789012345678901
Content-Type: multipart/mixed; boundary="12345678901234567890123456789012345678901234567890123456789012345678901234567890"

--12345678901234567890123456789012345678901234567890123456789012345678901234567890
Content-Type: text/plain

1
--1234567890123456789012345678901234567890123456789012345678901234567890123456789012
Content-Type: text/plain

22
--123456789012345678901234567890123456789012345678901234567890123456789012345678901
Content-Type: text/plain

333
--12345678901234567890123456789012345678901234567890123456789012345678901234567890
Content-Type: text/plain

4444

---- EXPECTED STRUCTURE ----{
  "html_body": [
    3
  ],
  "text_body": [
    3
  ],
  "attachments": [
    4
  ],
  "parts": [
    {
      "headers_rfc": {
        "content_type": {
          "ContentType": {
            "c_type": "multipart",
            "c_subtype": "mixed",
            "attributes": {
              "boundary": "1234567890123456789012345678901234567890123456789012345678901234567890123456789012"
            }
          }
        }
      },
      "headers_raw": [
        [
          {
            "Rfc": "content_type"
          },
          {
            "start": 13,
            "end": 125
          }
        ]
      ],
      "is_encoding_problem": false,
      "body": {
        "Multipart": [
          1
        ]
      },
      "offset_header": 0,
      "offset_body": 126,
      "offset_end": 997
    },
    {
      "headers_rfc": {
        "content_type": {
          "ContentType": {
            "c_type": "multipart",
            "c_subtype": "mixed",
            "attributes": {
              "boundary": "123456789012345678901234567890123456789012345678901234567890123456789012345678901"
            }
          }
        }
      },
      "headers_raw": [
        [
          {
            "Rfc": "content_type"
          },
          {
            "start": 224,
            "end": 335
          }
        ]
      ],
      "is_encoding_problem": false,
      "body": {
        "Multipart": [
          2
        ]
      },
      "offset_header": 211,
      "offset_body": 336,
      "offset_end": 997
    },
    {
      "headers_rfc": {
        "content_type": {
          "ContentType": {
            "c_type": "multipart",
            "c_subtype": "mixed",
            "attributes": {
              "boundary": "12345678901234567890123456789012345678901234567890123456789012345678901234567890"
            }
          }
        }
      },
      "headers_raw": [
        [
          {
            "Rfc": "content_type"
          },
          {
            "start": 433,
            "end": 543
          }
        ]
      ],
      "is_encoding_problem": false,
      "body": {
        "Multipart": [
          3,
          4
        ]
      },
      "offset_header": 420,
      "offset_body": 544,
      "offset_end": 997
    },
    {
      "headers_rfc": {
        "content_type": {
          "ContentType": {
            "c_type": "text",
            "c_subtype": "plain",
            "attributes": null
          }
        }
      },
      "headers_raw": [
        [
          {
            "Rfc": "content_type"
          },
          {
            "start": 640,
            "end": 652
          }
        ]
      ],
      "is_encoding_problem": false,
      "body": {
        "Text": "1\n--1234567890123456789012345678901234567890123456789012345678901234567890123456789012\nContent-Type: text/plain\n\n22\n--123456789012345678901234567890123456789012345678901234567890123456789012345678901\nContent-Type: text/plain\n\n333"
      },
      "offset_header": 627,
      "offset_body": 653,
      "offset_end": 883
    },
    {
      "headers_rfc": {
        "content_type": {
          "ContentType": {
            "c_type": "text",
            "c_subtype": "plain",
            "attributes": null
          }
        }
      },
      "headers_raw": [
        [
          {
            "Rfc": "content_type"
          },
          {
            "start": 979,
            "end": 991
          }
        ]
      ],
      "is_encoding_problem": true,
      "body": {
        "Text": "4444\n"
      },
      "offset_header": 966,
      "offset_body": 992,
      "offset_end": 915
    }
  ]
}