This study addresses issues concerning the so-called service by a court enforcement officer. The provisions specified in art. 1391 of the Code of Civil Procedure were implemented under the Act of 4 July 2019 amending the Code of Civil Procedure and certain other acts. This study constitutes an attempt to define the personal and material scope of application of art. 1391 of the Code of Civil Procedure. Along with the analysis of the material scope, a catalogue of documents which are subject to service by a court enforcement officer is specified. The author discusses in particular whether the following documents are subject to service by a court enforcement officer: petitions for summons to a conciliation session, petitions for securing evidence submitted prior to initiation of the proceeding, decisions to refer the case to a different court for adjudication, court orders and obligations toward the court. In addition, the personal scope of the provision in question is broadly reflected upon and it is determined whether art. 1391 of the Code of Civil Procedure shall apply to legal persons. This study is based on the provisions of law in force laid down in the Code of Civil Procedure, in particular in art. 1391 of the Code. Moreover, the author make use of the professional literature and judicial decisions issued hitherto. The study concerns the application of the provisions of art. 1391 of the Code of Civil Procedure in the jurisprudence. More precisely, I take into consideration the decisions of courts of appeal competent for the area of Łódź and Warsaw by using the documentation gathered in the legal office I work in.