ยง 5020-a. Payment of judgment in certain cases. When a judgment debtor has shown to the satisfaction of the clerk of the court from which an execution has been issued that a sum of money which satisfies the judgment had been sent to the last known address of the judgment creditor by registered or certified mail, return receipt requested, but was returned as unclaimed or undeliverable by the post office, the judgment debtor may deposit with the clerk of such court a certified check in an amount equal to the sum of money which satisfies the judgment. Upon receipt of such check any additional charges relating to an execution shall cease to accrue against the judgment debtor and the clerk shall forthwith notify each sheriff to whom an execution was issued that such execution is hereby rescinded. Such notice shall not be effective upon the sheriff until its receipt by him from the clerk. Provided, however, no entry of the satisfaction on the docket of the judgment made be made by the clerk except pursuant to the provisions of section 5021.