(1)By the Division. Service of complaints, orders, decisions, pleadings, motions, processes, and other documents of the Division shall be by First Class mail.(2)On the Division. For the purpose of proceedings under 950 CMR 101.03 only, service upon the Division may be effected by filing the paper or papers with the Director or any attorney employed by the Division.(3)Parties and Other Persons. All papers, including but not limited to, applications, notices, pleadings, petitions, motions, briefs, memoranda and other documents, filed by any party or other person with the Division or a hearing examiner shall be served by personal delivery or by registered mail upon all parties to the proceedings. Proof of service shall accompany all papers when filed or shall be filed within ten days thereafter.