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Date: Thu, 27 Apr 2017 22:16:23 +0200
From: <sender@example.com>
To: <recipient@example.com>
Subject: hidden alternative attachment
Message-Id: <hidden-alt-attachment@example.com>
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="------alternative"
--------alternative
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
This is the plain text part
--------alternative
Content-Type: multipart/mixed; boundary="------mixed"
--------mixed
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<html><body><p>This is the HTML part</p></body></html>
--------mixed
Content-Type: application/octet-stream;
name="binary.bin"
Content-Disposition: attachment;
filename="binary.bin"
Content-Transfer-Encoding: base64
dGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZw==
--------mixed--
--------alternative--