Message-ID: <...>
MIME-Version: 1.0
Content-Type: multipart/related;
boundary="----=_Part_0_1134128170.1447659361365"
x-bar: also there
included: must be included
x-foo: any value
------=_Part_0_1134128170.1447659361365
Content-Type: text/plain
Content-Transfer-Encoding: 8bit
Body text
------=_Part_0_1134128170.1447659361365
Content-Type: application/binary
Content-Transfer-Encoding: binary
Content-Disposition: attachment; filename="Attachment File Name"
[binary content]
------=_Part_0_1134128170.1447659361365
Message-ID: <...>
MIME-Version: 1.0
Content-Type: multipart/related;
boundary="----=_Part_0_1134128170.1447659361365"
x-bar: also there
included: must be included
x-foo: any value
------=_Part_0_1134128170.1447659361365
Content-Type: text/plain
Content-Transfer-Encoding: 8bit
Body text
------=_Part_0_1134128170.1447659361365
Content-Type: application/binary
Content-Transfer-Encoding: binary
Content-Disposition: attachment; filename="Attachment File Name"
[binary content]
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