12- 180 C.M.R. ch. 11, § 44
At least 15 calendar days prior to the election or prior to the distribution of ballots for any election to be conducted by mail, or 7 calendar days following receipt of the Notice of Election, whichever is earlier, the employer shall actually deliver to each labor organization that is a party to the proceeding and to any individual petitioner a list of the names and addresses of the employees in the unit who are employed at the time of the submission of the list and who are otherwise eligible to vote under section 43 of this Chapter. A copy of this voter list must also be simultaneously filed with the Board. If the period of time between the date of the filing of the petition and the date of the election exceeds 6 months, then the list must contain the names and addresses of otherwise eligible employees who have been employed at least six months and who are employed on the date of the election. In case of mail balloting, the Board may accept pre-addressed, gummed labels from the employer in satisfaction of this requirement. In large units, if the employer is not able to provide pre-addressed labels, the Board may demand the list of eligible voters up to 20 calendar days prior to the date of mail ballot distribution.
12- 180 C.M.R. ch. 11, § 44