(a)System.--The treasurer shall establish a system of effecting notice to interested parties. The procedure shall be reasonably calculated under the circumstances to apprise the interested parties of the pendency of the sale and to afford parties the opportunity to defend their interests in the property.(b)Service.--Service of written notice made by certified mail is complete when the notice is mailed. If the notice is not delivered or claimed, delivery is refused, the return receipt is not executed or the treasurer fails to receive information from the post office respecting the notice before the date fixed for sale, the validity of the service shall not be impaired and the sale shall proceed at the time fixed by the notice. Information or material received by the treasurer from the post office respecting the notice, whether before or after the sale, shall be included in the treasurer's report filed with the court under section 305.(c)Challenge.--A challenge by an owner to the inclusion of a property in the sale shall be taken by the owner within ten days after service of written notice by filing a verified objection in writing with the treasurer.(d)Effect of notice.--No sale may be set aside and no title to property sold may be invalidated if notice was given under this section. 1984, Oct. 11, P.L. 876, No. 171, § 203, effective in 60 days.