(1)Service. (a)General Rule. Service of all papers relating to any proceeding, including complaints, orders, decisions, pleadings, motions, processes, notices, briefs, claims of appeal, and exhibits, shall be by personal delivery, first-class mail, or electronic service pursuant to the Department's Electronic Filing Guidelines.(b)On Whom Served. All such papers shall be served by the person filing the same on every person who has theretofore entered an appearance in the proceeding. If a person appears after the paper has been filed, a copy of all papers previously filed shall be furnished to such person, if he so requests. Proof of service shall accompany all papers when filed. If service in accordance with 220 CMR 1.05(b) is deemed by any person to be too burdensome, application may be made to the Department or to the presiding officer for relief.(c)Service by the Department. A copy of any paper served by the Department, showing the addressees to whom the paper was mailed or electronically served, shall be placed in the Department's files and shall be prima facie evidence of service and the date thereof.Amended by Mass Register Issue 1315, eff. 6/17/2016.