In proceedings before the European Patent Office, documents may be filed by delivery by hand, by post or by technical means of communication. The President of the European Patent Office shall lay down the details and conditions and, where appropriate, any special formal or technical requirements for the filing of documents. In particular, he may specify that confirmation must be supplied. If such confirmation is not supplied in due time, the European patent application shall be refused; documents filed subsequently shall be deemed not to have been received.