标签： email mime-types content-type mime
如果我创建多部分/混合MIME邮件，是否需要对Content-Transfer-Encoding: base64个附件使用Content-Type: text/plain？或者任何text/plain也可以设置为Content-Transfer-Encoding: quoted-printable，并作为正确的附件发送？
Content-Transfer-Encoding: base64
Content-Type: text/plain
text/plain
Content-Transfer-Encoding: quoted-printable