The insurer or vendor of portable electronics must maintain proof of mailing in a form authorized or accepted by the United States postal service or other commercial mail delivery service. If a notice or correspondence is sent by electronic means, it must be sent to the vendor of portable electronics at the vendor's electronic mail address specified for that purpose and to its affected enrolled customers' last known electronic mail address as provided by each enrolled customer to the insurer or vendor of portable electronics, as the case may be.
For purposes of this subsection, an enrolled customer's provision of an electronic mail address to the insurer, supervising person, or vendor of portable electronics means that the enrolled customer consents to receive notices and correspondence by electronic mail as long as a disclosure to that effect is provided to the consumer at the time the consumer provides an electronic mail address. The insurer or vendor of portable electronics, as the case may be, must maintain proof that the notice or correspondence was sent.
RCW 48.18.278