+
+cat <<EOF > content_types
+From: Todd <todd@example.com>
+To: todd@example.com
+Subject: odd content types
+Date: Mon, 12 Jan 2014 18:12:32 +0000
+User-Agent: Notmuch/0.5 (http://notmuchmail.org) Emacs/23.3.1 (i486-pc-linux-gnu)
+Message-ID: <KfjfO2WJBw2hrV2p0gjT@example.com>
+MIME-Version: 1.0
+Content-Type: multipart/alternative; boundary="==-=-=="
+
+--==-=-==
+Content-Type: application/unique_identifier
+
+<p>This is an embedded message, with a multipart/alternative part.</p>
+
+--==-=-==
+Content-Type: text/some_other_identifier
+
+This is an embedded message, with a multipart/alternative part.
+
+--==-=-==--
+EOF
+cat content_types >> ${MAIL_DIR}/odd_content_type