Minnesota Instructions — Service by Mail and Post is a process that can be used to serve legal documents in Minnesota. It is used when a party involved in a case cannot be found or cannot be served in person. The documents can be served by mail or post. There are two types of Minnesota Instructions — Service by Mail and Post: 1. Service by Mail: This is a process in which the documents are sent by mail to the party that needs to be served. The documents must include a document that explains the service and a return receipt. The return receipt must be signed by the party that has been served. 2. Service by Post: This is a process in which the documents are sent by post to the party that needs to be served. The documents must include a document that explains the service and a return postcard. The return postcard must be signed by the party that has been served.