Said notice shall in all cases be served: 1. By publication in the county in which the petition is filed, once each week for three consecutive weeks, in a newspaper designated by the court; and 2. Upon all the alleged distributees of the estate of said absentee by ordinary mail addressed to them at their last known address. [C97, §3307; S13, §3307; C24, 27, 31, 35, 39, § 11903; C46, 50, 54, 58, 62, §634.3; C66, 71, 73, 75, 77, 79, 81, §633.512 ]