For purposes of complying with Titles 48 RCW and 284 WAC, whenever written notice to the commissioner is required, "sending" or "delivery" of the written notice includes transmitting the required information in writing and, where appropriate, on forms designated by the commissioner for that purpose via first class mail, commercial parcel delivery company, telefacsimile, or email, unless the relevant requirement specifies sending the written notice in some specific manner, such as via first class mail, postage prepaid.