Uptonow, the Administrative and Recording Unit in S-1 Informatics Engineering Study Program at ITN Malang still used manual methods in managingadministrativedocuments, especially for incoming and outgoing mail. Supporting documents were stillstored in eachwork unit and were not archived correctly causing the letter documents were often difficult of indifneeded. This was a contrary to the concep t of green management system. In response to this problem, a system that was able to over come difficulties in managing incoming letters and outgoing mail and the document filing process was needed. The purpose of this study was to implement a Letter Management System (SANES) as an effort to improve administrative service and recording performance in S-1 Informatics Engineering Study Program at ITN Malang. The results showed that SANES application was able to simplify the process and organization of incoming and outgoing mail data and to support the concept of a green management system integrating data needs; therefore,it had an impact on improving performance services in S-1 Informatics Engineering study programs.