In this thesis, the levels of IT support provided to users by the most frequently used alternative postal service providers Tisak, DPD, and Overseas Express are compared with the universal postal service provider, Croatian Post. The study focuses on analyzing the availability and efficiency of digital solutions that facilitate the process of postal parcel submission for users. Special emphasis is placed on the development of a web application that allows users to complete the P-10m forms of Croatian Post, which currently can only be filled out manually at post offices. The web application offers a quick and efficient solution for filling out and printing the form, thereby reducing the need for direct system support and simplifying the entire process for users. The developed application enables users to easily print the completed form and take it to the nearest Croatian Post office, significantly reducing the time and effort required for postal parcel submission. The paper presents a detailed comparative analysis of the advantages and disadvantages of IT support among the selected postal service providers, with the aim of identifying best practices and opportunities for improving user experience in the postal sector. The thesis concludes with an assessment of the current state of IT support in the postal sector in the Republic of Croatia and offers recommendations for further improvements, emphasizing the integration of advanced digital solutions to facilitate the process of postal parcel submission for users.