From: someone@example.com
To: list@example.com
Message-ID: 123456789@example.com
Subject: A test
Content-Type: multipart/mixed; boundary="xxxyyyzzz"

--xxxyyyzzz
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable

--xxxyyyzzz
Content-Type: application/pdf; name="someExample.pdf"
Content-Disposition: attachment; filename="someExample.pdf"
Content-Transfer-Encoding: base64

JVBERi0xLjcKJcOkw7zDtsOfCjIgMCBvYmoKPDwvTGVuZ3RoIDMgMCBSL0ZpbHRlci9GbGF0ZURl
Y29kZT4+CnN0cmVhbQp477+9Le+/vU0KICAgICDvv70w77+977+9eO+/vdC+77+91q3vv70xcO+/
ve+/ve+/ve+/ve+/ve+/ve+/vTpRUO+/ve+/ve+/vVvvv73vv73vv70sWFvvv71d77+977+9XAlb
KE/vv70tNO+/ve+/vTzvv70+77+9fe+/ve+/vS/vv71iXcuxO++/ve+/vWnvv73vv71QIlzvv711
ZAphUe+/vcmzCkllSjZRNe+/vUbvv73vv73vv73vv70377+9CiAgICAgICAgICAgICAgXijvv70K
ZW5kc3RyZWFtCmVuZG9iago=

--xxxyyyzzz--
