BODY (
   (
      "text" "plain" (
         "charset" "utf-8"
      ) NIL NIL "7bit" 54 0
   )(
      "message" "rfc822" NIL NIL NIL "base64" 1179 (
         "Tue, 14 Dec 2021 11:48:25 +0100" "HTML test" (
            (
               "Name" NIL "email" "example.com"
            )
         ) (
            (
               "Name" NIL "email" "example.com"
            )
         ) (
            (
               "Name" NIL "email" "example.com"
            )
         ) (
            (
               "email@example.com" NIL "email" "example.com"
            )
         ) NIL NIL NIL "<random-message-id@example.com>"
      ) (
         (
            "text" "plain" (
               "charset" "utf-8" "format" "flowed"
            ) NIL NIL "7bit" 30 0
         )(
            "text" "html" (
               "charset" "utf-8"
            ) NIL NIL "7bit" 173 8
         ) "alternative"
      ) 0
   ) "mixed"
)

BODYSTRUCTURE (
   (
      "text" "plain" (
         "charset" "utf-8"
      ) NIL NIL "7bit" 54 0 "e377afc895a2c4c0d17b378f355de59e" NIL NIL NIL
   )(
      "message" "rfc822" NIL NIL NIL "base64" 1179 (
         "Tue, 14 Dec 2021 11:48:25 +0100" "HTML test" (
            (
               "Name" NIL "email" "example.com"
            )
         ) (
            (
               "Name" NIL "email" "example.com"
            )
         ) (
            (
               "Name" NIL "email" "example.com"
            )
         ) (
            (
               "email@example.com" NIL "email" "example.com"
            )
         ) NIL NIL NIL "<random-message-id@example.com>"
      ) (
         (
            "text" "plain" (
               "charset" "utf-8" "format" "flowed"
            ) NIL NIL "7bit" 30 0 "6891396510cbadf4e2cfe31aee5bd25f" NIL NIL NIL
         )(
            "text" "html" (
               "charset" "utf-8"
            ) NIL NIL "7bit" 173 8 "1a04bd2ec90f44a42792eacdc14fe8ea" NIL NIL NIL
         ) "alternative" (
            "boundary" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
         ) NIL "en-US" NIL
      ) 0 "eb1ac6e049a544c2bda1b7787e03db50" (
         "attachment" (
            "filename" "attached_email.eml"
         )
      ) NIL NIL
   ) "mixed" (
      "boundary" "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
   ) NIL NIL NIL
)

BODY[] {1649}
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--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

This is a message with a base64 encoded attached email
--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Disposition: attachment; filename="attached_email.eml"
Content-Type: message/rfc822
Content-Transfer-Encoding: base64

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--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb--

BINARY[] {1649}
Content-Type: multipart/mixed;
 boundary=bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

This is a message with a base64 encoded attached email
--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Disposition: attachment; filename="attached_email.eml"
Content-Type: message/rfc822
Content-Transfer-Encoding: base64

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--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb--

BINARY.SIZE[] 1649
----------------------------------
BODY[HEADER] {83}
Content-Type: multipart/mixed;
 boundary=bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb


----------------------------------
BODY[TEXT] {1566}
--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

This is a message with a base64 encoded attached email
--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Disposition: attachment; filename="attached_email.eml"
Content-Type: message/rfc822
Content-Transfer-Encoding: base64

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YWFhYWFhYWFhYWFhYS0tDQo=
--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb--

----------------------------------
BODY[MIME] {84}
Content-Type: multipart/mixed;
 boundary=bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb


----------------------------------
BODY[1] {54}
This is a message with a base64 encoded attached email
BINARY[1] {54}
This is a message with a base64 encoded attached email
BINARY.SIZE[1] 54
----------------------------------
BODY[1.HEADER] {73}
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


----------------------------------
BODY[1.TEXT] {54}
This is a message with a base64 encoded attached email
----------------------------------
BODY[1.MIME] {74}
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


----------------------------------
BODY[1.1] {54}
This is a message with a base64 encoded attached email
BINARY[1.1] {54}
This is a message with a base64 encoded attached email
BINARY.SIZE[1.1] 54
----------------------------------
BODY[2] {1179}
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BINARY[2] {872}
Content-Type: multipart/mixed;
 boundary=bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

This is a message with a base64 encoded attached email
--bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
Content-Disposition: attachment; filename="attached_email.eml"
Content-Type: message/rfc822
Content-Transfer-Encoding: base64

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BINARY.SIZE[2] 872
----------------------------------
BODY[2.HEADER] {319}
To: "email@example.com" <email@example.com>
From: Name <email@example.com>
Subject: HTML test
Message-ID: <random-message-id@example.com>
Date: Tue, 14 Dec 2021 11:48:25 +0100
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
Content-Language: en-US


----------------------------------
BODY[2.TEXT] {553}
This is a multi-part message in MIME format.
--aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit

This is an *HTML* test message
--aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 7bit

<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    This is an <b>HTML</b> test message
  </body>
</html>

--aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa--

----------------------------------
BODY[2.MIME] {128}
Content-Disposition: attachment; filename="attached_email.eml"
Content-Type: message/rfc822
Content-Transfer-Encoding: base64


----------------------------------
BODY[2.1] {30}
This is an *HTML* test message
BINARY[2.1] {30}
This is an *HTML* test message
BINARY.SIZE[2.1] 30
----------------------------------
BODY[2.1.HEADER] {91}
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit


----------------------------------
BODY[2.1.TEXT] {30}
This is an *HTML* test message
----------------------------------
BODY[2.1.MIME] {91}
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit


----------------------------------
BODY[2.1.1] {30}
This is an *HTML* test message
BINARY[2.1.1] {30}
This is an *HTML* test message
BINARY.SIZE[2.1.1] 30
----------------------------------
BODY[2.2] {173}
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    This is an <b>HTML</b> test message
  </body>
</html>

BINARY[2.2] {173}
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    This is an <b>HTML</b> test message
  </body>
</html>

BINARY.SIZE[2.2] 173
----------------------------------
BODY[2.2.HEADER] {75}
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 7bit


----------------------------------
BODY[2.2.TEXT] {173}
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    This is an <b>HTML</b> test message
  </body>
</html>

----------------------------------
BODY[2.2.MIME] {75}
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 7bit


----------------------------------
BODY[2.2.1] {173}
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    This is an <b>HTML</b> test message
  </body>
</html>

BINARY[2.2.1] {173}
<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    This is an <b>HTML</b> test message
  </body>
</html>

BINARY.SIZE[2.2.1] 173
----------------------------------
BODY[HEADER.FIELDS (FROM TO)] {2}


----------------------------------
BODY[HEADER.FIELDS (FROM TO)]<10> {0}

----------------------------------
BODY[HEADER.FIELDS.NOT (SUBJECT CC)] {84}
Content-Type: multipart/mixed;
 boundary=bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb


----------------------------------
BODY[HEADER.FIELDS.NOT (SUBJECT CC)]<10> {25}
pe: multipart/mixed;
 bou
----------------------------------