There have been or there are public enterprises (or private ones) bearing real monopoly of activity in certain areas in numerous EU’s member states. It concerns especially services of common character such as mailing services. Monopoly itself is not economically justified; it leads to high prices in most cases, low quality of services and technological delay (Kowalski and Ślusarczyk 2010, p. 208). Mailing services have been a subject of anti-monopoly policy realized by the European Union for years. Many experiments of the EU’s anti-monopoly policy remain in central authorities’ competences. It favors to development of competition since it does not include regulations founding particular exceptions or exemptions from using as below: (i) general competition law; (ii) limits concerning horizontal cartels; (iii) limits concerning vertical relations and abusing a dominant position and; (iv) limits within performing fusions. In case of mailing services, one should still speak about occurring regulation barriers connected with access. Competition is still limited in the sector of mailing services as regards letters. Although mailing services are principally open for competition in the part concerning parcels and telecommunication. Maintaining high standards is of significant importance but it should be cared that it would not lead to blocking possibilities of development of enterprising companies and causing high prices and limited supply of important services (Small and medium enterprises and entrepreneurship policy 2012, p. 103)