The main idea of this study is the universal nature of the interpretation expressed by the Supreme Administrative Court in its resolution of 6 December 2021 (I FPS 2/21) on the need to sign procedural letters delivered electronically as attachments to the so-called general writings. The Supreme Administrative Court clearly "reminded" that the primary role in the issue of the importance of a signature (including an electronic one) in administrative court proceedings is played by legal provisions and not by the technical possibilities made available by the creators of ICT systems to their users. The Supreme Administrative Court indicated that from the perspective of procedural regulations, the key is the signature contained in the complaint to the Provincial Administrative Court and not the general ePAUP letter, a kind of electronic envelope that can include various letters. Administrative courts also began to apply the above position to cassation appeals, complaints, objections, and powers of attorney submitted as part of proceedings before these courts. Administrative decisions, resolutions, applications, and powers of attorney submitted in administrative proceedings, including tax and enforcement proceedings, must also meet the requirements of the resolution in question.
Keywords: electronic signature; electronic delivery; ePAUP; complaint to the Provincial Administrative Court; administrative decision