Content-Type: multipart/mixed; boundary=longrandomstring
From: Sender <sender@pm.me>
To: Receiver <receiver@pm.me>


This is a multi-part message in MIME format.
--longrandomstring
Content-Type: multipart/alternative; boundary="0194fdc2fa2ffcc041d3ff12045b73c86e4ff95ff662a5eee82abdf44a2d"


This is a multi-part message in MIME format.
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Content-Transfer-Encoding: base64
Content-Type: text/html

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--0194fdc2fa2ffcc041d3ff12045b73c86e4ff95ff662a5eee82abdf44a2d--
.

--longrandomstring
Content-Transfer-Encoding: base64
Content-Type: application/octet-stream

aWYgeW91IGFyZSByZWFkaW5nIHRoaXMsIGhpIQ==
--longrandomstring--
.