S.D. Codified Laws § 58-47-13
If any notice or correspondence with respect to a policy of portable electronics insurance is required, the notice or correspondence shall be in writing and mailed within any notice period specified within the statute or regulation requiring the notice or correspondence. Notwithstanding any other law, any notice or correspondence may be mailed by postal or electronic means. If the notice or correspondence is mailed through any postal service, the notice or correspondence shall be sent to the vendor of portable electronics at the vendor's mailing address specified for that purpose and to its affected enrolled customer's last known mailing address on file with the insurer. Either the insurer or vendor of portable electronics shall maintain proof of mailing in a form authorized or accepted by the United States Postal Service or any other commercial mail delivery service. If the notice or correspondence is mailed by electronic means, the notice or correspondence shall be sent to the vendor of portable electronics at the vendor's electronic mail address specified for that purpose and to its affected enrolled customer's last known electronic mail address as provided by each enrolled customer to the insurer or vendor of portable electronics. An enrolled customer's provision of an electronic mail address to the insurer or vendor of portable electronics is deemed to be consent to receive notice or correspondence by electronic means so long as a disclosure is provided to the customer within a reasonable time following purchase of the portable electronics. The insurer or vendor of portable electronics shall maintain proof that any notice or correspondence was electronically mailed to an enrolled customer. Notice or correspondence may be sent on behalf of any insurer or vendor, by the supervising entity appointed by the insurer.
SDCL 58-47-13