Rule 5(a) thus requires all papers to be served on all parties to the actionwith the following exceptions: (1) orders and judgments not required by their terms to be served; (2) ex parte motions; (3) any pleadings, motions, notices, or other papers when the opposing party is in default for failure to appear, and no new or additional claim for relief is asserted; (4) certain pleadings when the cour