Attachment filtering in Postfix Filed under ( Postfix )

How to configure postfix to filter mail attachments based on file extension? This was one of the question has been lurking in my mind for past few days. Finally i got the solution from my fren "google". Its can be done by 3 simple steps as follow

1) Edit main.cf and add this line > mime_header_checks = regexp:/etc/postfix/mime_header_checks
2) Edit mime_header_checks file and add /name=[^>]*\.(bat|com|exe|dll|vbs|jpg)/ REJECT
It means that, all the file extension listed will be rejected during file attachment.You can add more file extensions by adding this line with |.
3) Postmap mime_header_checks

You are done. Now try to attach the rejected file extension and you will see a pop up message on attachment filtering.