(b) Mailing to accompany publication in matrimonial actions. An order for service of a summons by publication in a matrimonial action shall also direct that on or before the first day of publication a copy of the summons be mailed to the person to be served unless a place where such person probably would receive mail cannot with due diligence be ascertained and the court dispenses with such mailing. A notice of publication shall be enclosed.
(c) Time of publication; when service complete. The first publication of the summons shall be made within thirty days after the order is granted. Service by publication is complete on the twenty-eighth day after the day of first publication, except that in a matrimonial action it is complete on the twenty-first day after the day of first publication.