Subject: Hide and seek
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=1

--1
Content-Type: multipart/signed; protocol="signature/plain"; migalc="pen+paper"; boundary=2
X-Signature-Type: penmanship

--2
Content-Type: multipart/alternative; boundary=3

--3
Content-Type: text/html; charset=us-ascii

<html><head><title>Search me</title></head><body><p>Don't find me here</p></body></html>

--3
Content-Type: text/plain
Content-Transfer-Encoding: binary

Search me, and Find me here
--3--

--2
Content-Type: signature/plain; charset=us-ascii

Signed by undersigned
--2--

--1--
---- EXPECTED STRUCTURE ----
{
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    "mime_version": "1.0",
    "subject": "Hide and seek",
    "content_type": {
      "c_type": "multipart",
      "c_subtype": "mixed",
      "attributes": {
        "boundary": "1"
      }
    }
  },
  "html_body": [
    {
      "header": {
        "content_type": {
          "c_type": "text",
          "c_subtype": "html",
          "attributes": {
            "charset": "us-ascii"
          }
        }
      },
      "contents": "<html><head><title>Search me</title></head><body><p>Don't find me here</p></body></html>\n"
    }
  ],
  "text_body": [
    {
      "header": {
        "content_transfer_encoding": "binary",
        "content_type": {
          "c_type": "text",
          "c_subtype": "plain"
        }
      },
      "contents": "Search me, and Find me here"
    }
  ],
  "attachments": [
    {
      "Binary": {
        "header": {
          "content_type": {
            "c_type": "signature",
            "c_subtype": "plain",
            "attributes": {
              "charset": "us-ascii"
            }
          }
        },
        "contents": [
          83,
          105,
          103,
          110,
          101,
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          32,
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          121,
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}