Me. Rev. Stat. tit. 19-A, § 1604

Service of a notice under section 1605 must be made by personal service as provided for personal service of summons by the Maine Rules of Civil Procedure, Rule 4(d). Personal service within the State of a notice under section 1605 may be made by an authorized representative of the commissioner. Personal service outside the State of a notice under section 1605 may be made in the manner provided for personal service of summons outside the State by the Maine Rules of Civil Procedure, Rule 4(e).