Subject: Inline attachment
From: %FROM_ADDRESS%
To: %TO_ADDRESS%
Message-ID: <1234@example.com>
Date: %DATE%
Content-Type: multipart/mixed; boundary=boundary1
--boundary1
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Hello World HTML
Hello World
--boundary1
Content-Type: application/pdf; name=Hello-World.pdf
Content-Transfer-Encoding: base64
Content-Disposition: inline; name=Hello-World.pdf;
filename=Hello-World.pdf
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