In all suits against the state of Mississippi, any board, bureau, commission, or department thereof required to be defended by the attorney general, a completed copy of the bill of complaint, declaration, or other original pleading shall be mailed by the plaintiff or complainant to the attorney general, postage prepaid, properly addressed to him; and such original pleading shall bear a proper certificate to such effect when it is filed. No decree pro-confesso or default judgment shall be taken against such defendant.