Mass. Gen. Laws ch. 271 § 22
Whoever receives a letter, package or parcel for delivery to or transportation from a person, or delivers or transports the same to or from a person, having reasonable cause to believe that such person is engaged or in any way concerned in the management or promotion of or agency for a lottery, or the game known as policy lottery or policy, or the buying or selling of pools or registering of bets, or other form of illegal gaming, and that such letter, package or parcel has relation to such business, shall be punished by a fine of not less than fifty nor more than five hundred dollars; but this section shall not apply to the receipt, carriage or delivery of United States mail matter by an officer or employee thereof.
Mass. Gen. Laws ch. 271, § 22