Mass. Gen. Laws ch. 210, § 6C
(c) To be approved by the court, an agreement for post-adoption contact or communication shall contain the following statements:
(iv) The parties have not relied on any representations other than those contained in this agreement.
The agreement shall be signed by the parties and acknowledged before a notary public as the free act and deed of the parties. If the child is above the age of 12, the agreement shall contain the written consent of the child. If the child is in the custody of the department of children and families, the agreement shall contain the written approval of the department and the attorney for the child. If the child is in the custody of a licensed child care agency, the agreement shall contain the written approval of the agency.
(d) To be enforceable, an agreement for post-adoption contact or communication shall be: