Unless the court otherwise orders, every order required by its terms to be served; every pleading subsequent to the original complaint; every paper relating to discovery required to be served on a party; every amendment; every written motion other than one which may be heard ex parte; and, every written notice, appearance, demand, offer of judgment, designation of record on appeal, and similar papers shall be served upon each of the parties; but no service need be made on parties adjudged in default for failure to appear, except that pleadings asserting new or additional claims for relief against them shall be served upon them in the manner provided for service of summons, or for constructive service, in Rules 4, 4A, or 4B.