65- 407 C.M.R. ch. 110, § 4
Except as otherwise provided in this Chapter or another Commission rule or by statute, a proceeding is commenced upon filing, unless the Administrative Director or presiding officer finds that the filing fails to include all of the information required by statute or Commission rule.
All filings shall be served on all other parties to a proceeding. The Commission may provide an electronic filing system to facilitate such service. If such electronic filing system automatically generates a notice of any filing to all parties to a proceeding, this shall meet a party's service obligation.
All documents shall be filed pursuant to the Commission requirements for electronic filing, unless the presiding officer or the Commission allows otherwise.
In computing any period of time prescribed or allowed by these rules, by order of the Commission, or by the applicable statute, the day of the act, event or default after which the designated period of time begins to run is not to be included. The last day of the period so computed is to be included unless it is not a regular business day, in which event the period runs until the end of the next day which is a regular business day. When the period of time prescribed or allowed is less than 7 days, intermediate Saturdays, Sundays and Holidays shall be excluded from the computation.
Copies of all documents filed with or by the Commission shall be available through the Commission's electronic filing system. Presiding officers shall ensure that parties who represent that they are unable to access documents through the electronic system receive service of documents through the regular mail.
65- 407 C.M.R. ch. 110, § 4