The notice to be given to creditors by mail as provided in Section 331 of Title 58 of the Oklahoma Statutes shall be given by mailing by regular first-class mail a file-stamped copy of said notice on or before the tenth day following the date said notice is filed with the district court clerk for the county in which the probate is pending. Said mailing shall be made to all known creditors of the decedent by the personal representative, or by the personal representative's attorney who may rely upon a list of known creditors submitted to said attorney by the personal representative. No notice by mail shall be required with respect to a creditor whose identity and address were not known to the personal representative on the date said notice was filed, even though the personal representative may thereafter learn the identity or address of such creditor. Personal delivery, by the personal representative or the personal representative's attorney, of a copy of the notice to creditors to any creditor shall be the equivalent of mailing such copy to such creditor.