The commissioner shall cause a notice of such assessment order, setting forth a brief summary of the contents of such order to be:
(1) Published in such manner as shall be directed by the court; and
(2) Enclosed in a sealed envelope, addressed and mailed postage prepaid to each member or subscriber liable thereunder at his last known address as it appears on the records of the insurer, at least 20 days before the return of the order, to show cause provided for in Section 27-32-34.