Japan's recent disaster response management planning efforts have focused on non-structural measures. Many local governments often disseminate evacuation information through mail-based disaster information systems. Local governments make evacuation announcements based on their best judgment, and after that, they disseminate these announcements further using e-mails. However, there are no format of mail-based disaster information systems, and it has proven difficult to disseminate the appropriate evacuation information at the right time. Further, there are no current studies focused on developing a more suitable and effective management of mail-based disaster information system. We intend to analyze problems associated with current disaster information systems?with the objective of being able to recommend improvements?by focusing on actual evacuation information dissemination processes of mail-based disaster information systems. We begin with a survey of the actual content and timing of text messages issued by local governments. In this way, we are able to identify differences between text messages and time delays in the dissemination of evacuation information by local governments. Our case study is based on a survey of the evacuation information dissemination processes used in the case of Typhoon Man-yi (2013).