From: a@example.com Subject: blah Cc: test-public@example.com Message-ID: Content-Type: multipart/alternative; boundary="b" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit --b Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: base64 PGh0bWw+PGJvZHk+aGk8L2JvZHk+PC9odG1sPg== --b Content-Type: text/plain Content-Transfer-Encoding: quoted-printable hi =3D "bye"= --b--