(1)    Generally. Unless the statute requiring notice in a particular proceeding provides otherwise, notice required in the administration of an estate or other proceeding shall be given either by mail under sub. (2) or by personal service under sub. (3). The first notice given by mail in any administration or other proceeding must be accompanied by notice by publication given under sub. (4). Notice by publication in addition to mailed notice is required for subsequent hearings if the name or the post-office address of one or more persons entitled to notice has not been ascertained.

   (2)   Service by mail. Service shall be made by first class mail either within or without the state at least 20 days before the hearing or proceeding upon any person whose post-office address is known or can with reasonable diligence be ascertained.

   (3)   Personal service. Personal service shall be made at least 10 days before the hearing under s. 801.11, except as that section provides for service by publication and except that substituted service under s. 801.11 (1) (b) may not be made outside this state.

   (4)   Service by publication. Unless a statute provides otherwise, every court notice required to be given by publication shall be published as a class 3 notice in a newspaper published in the county, eligible under ch. 985, as the court by order directs.