From: user@example.com
To: list@example.com
Subject: A message with lots of parts
MIME-Verrsion: 1.0
Content-Type: multipart/mixed; boundary="aaa1"

--aaa1
Content-Type:multipart/alternative; boundary="aaa2"

--aaa2
Content-Type: text/plain

This is the first text/plain part

--aaa2
Content-Type: text/html

An html part to be scrubbed
--aaa2--

--aaa1
Content-Type: message/rfc822

From: user@example.com
To: other@example.com
Subject: Embedded Message
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="bbb1"

--bbb1
Content-Type: text/plain; charset="utf-8"

Plain text with “fancy quotes” from embedded message.

--bbb1
Content-Type: text/html; charset="utf-8"

HTML with “fancy quotes” from embedded message.

--bbb1--

--aaa1
Content-Type: image/jpeg; name="Image"
Content-Disposition: attachment; filename="Image"
Content-Description: A JPEG image

bogus jpeg data

--aaa1--