Subject: see attachment Message-ID: From: "John Smith" To: list@example.com MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: multipart/mixed; boundary="b" --b Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="attached_fart.txt" inside the attachment= --b Content-Type: text/plain; charset="US-ASCII" Content-Disposition: attachment; filename="part_deux.txt" Content-Transfer-Encoding: quoted-printable inside another= --b--