SDCL § 47-1A-141.2: Effective date of written notice by domestic or foreign corporation to shareholder.

Written notice by a domestic or foreign corporation to its shareholder, if in a comprehensible form, is effective upon deposit in the United States mail, if mailed postpaid and correctly addressed to the shareholder's address shown in the corporation's current record of shareholders; or when electronically transmitted to the shareholder in a manner authorized by the shareholder.