If your certificate is a soft exam paper certificate, you cannot apply for direct mail.

The status of the paper certificate for the soft exam is that it has been processed on site and cannot be applied for mailing. The reason is that in some areas, the method of receiving the soft examination certificate by mail has not been opened for the time being, and it needs to be collected on site. Since the soft examination paper certificate is issued by various places, the collection methods are different in different places.