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-Transfer-Encoding: quoted-printable

body
--longrandomstring
Content-Disposition: attachment
Content-Transfer-Encoding: quoted-printable

attachment
--longrandomstring--
.