boundary="subpart__1.1"
--subpart__1.1
-Content-Type: text/plain; charset="us-ascii"
+Content-Type: text/plain; charset="iso-8859-1"
Content-Disposition: attachment; filename="test1.txt"
This is the first text/plain part, in a subpart.
--subpart__1.1--
------- =_aaaaaaaaaa0
-Content-Type: text/plain; charset="us-ascii"
+Content-Type: text/plain; charset="iso-8859-1"
Content-Disposition: attachment; filename="test2.txt"
Content-MD5: kq+Hnc2SD/eKwAnkFBDuEA==
Content-Transfer-Encoding: quoted-printable
This is the second text/plain part.
------- =_aaaaaaaaaa0
-Content-Type: text/plain; charset="us-ascii"
+Content-Type: text/plain; charset="iso-8859-1"
Content-Disposition: attachment; filename="test3.txt"
This is the third text/plain part.
------- =_aaaaaaaaaa0
-Content-Type: text/plain; charset="us-ascii"; name="test4.txt"
+Content-Type: text/plain; charset="iso-8859-1"; name="test4.txt"
Content-Disposition: attachment; filename="test4.txt"
Content-Transfer-Encoding: base64
MIME-Version: 1.0
Content-Type: message/partial; id="test-mhstore message/partial test"; number=1
-Content-Type: text/plain; charset="us-ascii"
+Content-Type: text/plain; charset="iso-8859-1"
This is part one of three.
EOF