All subsequent pleadings and briefs filed in any formal complaint proceeding, as well as all letters, documents, or other written submissions, shall be filed using the Commission's Electronic Comment Filing System, excluding confidential material as set forth in
§ 1.731. In addition, all pleadings and briefs filed in any formal complaint proceeding, as well as all letters, documents, or other written submissions, shall be served by the filing party on the attorney of record for each party to the proceeding, or, where a party is not represented by an attorney, each party to the proceeding either by hand delivery, overnight delivery, or email, together with a proof of such service in accordance with the requirements of
§ 1.47(g). Service is deemed effective as follows: