Ohio Revised Code Title XXXI. Domestic Relations Children § 3107.067

(A) Before the birth of a child and with the written consent of the mother of the child, any of the following may serve or caused to be served actual notice to a putative father of the child that the mother of the child is considering placing the child for adoption:

(B) As used in this section, “actual notice” means written notice that is actually received by the putative father and includes personal service or certified mail, return receipt requested.