Cal. Ins. Code § 11028

Within 90 days from the approval thereof by the commissioner, all such amendments, or a synopsis thereof, shall be furnished to all members of the society either by being published in the official organ of the society or by being sent by mail. The affidavit of any officer of the society or of anyone authorized by it to mail any amendments or synopsis thereof, stating facts which show that same has been duly addressed and mailed, shall be prima facie evidence that such amendments or synopsis thereof have been furnished the addressee.