S.C. Code Ann. § 56-1-360: Form and proof of notice.

When notice is required concerning a person's driver's license, the notice must be given by the Department of Motor Vehicles by depositing the notice in the United States mail with postage prepaid addressed to the person at the address contained in the driver's license records of the department. The giving of notice by mail is complete ten days after the deposit of the notice. A certificate by the director of the department or his designee that the notice has been sent as required in this section is presumptive proof that the requirements as to notice of suspension have been met even if the notice has not been received by the addressee.