S.D. Codified Laws § 12-4-5.3
When a voter registration application is received by the county auditor, the county auditor or an individual designated by the county auditor shall review the application for eligibility and completeness. If the applicant is not eligible to be registered or sufficient information to complete the registration card cannot be obtained from the applicant, the county auditor must send an acknowledgment notice by nonforwardable mail to the applicant indicating the reason the registration was not filed. The acknowledgment notice must state that the applicant needs to submit the corrected information to the county auditor within thirty days or the voter registration form may not be processed. The county auditor shall send an acknowledgment notice by nonforwardable mail to the applicant whose registration is accepted. The State Board of Elections shall promulgate rules, pursuant to chapter 1-26, prescribing the form of the acknowledgement notice. The same confirmation mailing required by § 12-4-19 must be sent immediately to any person whose registration acknowledgment notice is returned undeliverable.
SDCL 12-4-5.3