How to disable tricky name detection of attached file? 

The header shows as below,we know it's format  not correct,seems one more " there,but as it is from big company tencent,we can not ask them to amend the email format.

Content-Type: application/pdf;
charset="UTF-8"
name="=?UTF-8?B?xxxxxxxxxxxxxx?=""
Content-Disposition: attachment;
filename="=?UTF-8?xxxxxxxxxxxxxx""
Content-Transfer-Encoding: base64