Subject: Fwd: report
From: Alice <alice@example.com>
To: Bob <bob@example.com>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=mix

--mix
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

hello
--mix
Content-Type: application/pdf; name=one.pdf
Content-Disposition: attachment; filename=one.pdf
Content-Transfer-Encoding: base64

b25l
--mix
Content-Type: application/pdf; name=two.pdf
Content-Disposition: attachment; filename=two.pdf
Content-Transfer-Encoding: base64

dHdv
--mix--