(a) Addressed to the FOIA Officer. A request for a record of the DOE which is not available in a public reading facility, as described in §1004.3, shall be: Addressed to the Headquarters or appropriate field FOIA Officer at the DOE at a location listed in §1004.2(h) of this part, and both the envelope and the letter shall be clearly marked ‘‘Freedom of Information Act Request;’’ or submitted electronically on the Headquarters or appropriate field FOIA Web sites. Except as provided in §1004.4(e), a request will be considered to be received by the DOE for purposes of 5 U.S.C. 552(a)(6) and the 20-day response period will start upon actual receipt by the appropriate FOIA Officer, or not later than 10 days after receipt by a designated FOIA Officer at any location in §1004.2(h). Requests delivered after regular business hours of the FOIA Officer are considered received on the next regular business day.