In all probate proceedings, service by mail may be made by the petitioner or the petitioner's attorney or by the register on the petitioner's behalf Personal service shall be made by a sheriff or a deputy within the sheriff's county, or by a constable or other person authorized by law, or by some person specially appointed by the court, except that a subpoena may be served as provided in Rule 45. Special appointments to serve process shall be made freely when substantial savings in travel fees will result. Service by publication shall be made by the register on behalf of the petitioner unless otherwise ordered by the court. When service by any method is to be made by the register, the petition shall contain a written request for such service, accompanied by a tender of fees and a list of persons to be served and their addresses if known.
Me. R. Prob. P. 4