Whenever the Greenville County Tax Collector levies upon real estate for taxes, he shall before advertising the property for sale give twenty days’ notice of the levy to the owner of each mortgage who has filed a request for such notice with the clerk of court, who shall transmit a list of the requests to the collector for filing. The twenty day period shall begin to run from such time as the notice is delivered personally or by registered mail. The notice shall contain a description of the land levied upon, the name of the owner thereof, the year or years for which taxes are assessed, and a statement thereof with the accrued cost. A return receipt shall be requested at the address given on the above mentioned list on delivery of the notice. The rights, interest, and security of a mortgagee are not affected by a tax sale and deed of conveyance pursuant thereto unless the foregoing stipulations are met. (Prior code § 1-5-46)