Where a document has reached the addressee, if the EPO is unable to prove that it has been duly notified, or if provisions relating to its notification have not been observed, the document is deemed to have been notified on the date established by the EPO as the date of receipt. In cases where the EPO is not able to prove the actual date of notification, a letter, for instance, sent by the addressees themselves and indicating the date of receipt, is accepted as proof.