Postfix filter

I am trying to set this policy:

If the sender send an e-mail consist attachment, he should Cc to another person, otherwise the e-mail will be rejected.

Code:

---

main.cf:
mime_header_checks = regexp:/etc/postfix/mime_header_checks

mime_headers_checks:
/^From: <email hidden>|^To: [^<email hidden>]|name=[^>]*\./ REJECT Please Cc to your boss.

---

The result all email got reject even without attachment.

Please help. Thanks.