Le Cam Loan creator Guha, Sumanta Chairperson Phan, Minh Dung Examination Committee Vatcharaporn Esichaikul Examination Committee Hau Giang160 {u2013} MeKong1000 {u2013} Vietnam Scholarship donor text series technical report th Pathum Thani, Thailand Asian Institute of Technology 2009 continuing eng 51 p. : ill. In a complex Email system with plenty of messages, each user can receive dozens of messages every day. How to recognize which messages should be read first and how to find important or prominent people in the system without knowing the messages' content. This study focuses on Email transactions that show relationships among entities via messages' transference in the system to discover important messages and important people from email log. Important messages are messages that contain interesting information or impoliant contents and important people are those who have strong effects on the community via sending and receiving several messages. Two data structures are introduced for this task. The Email transaction multi-digraph is used to represent the email transactions which are encoded in the mail log. Whereas, the messages' flow is used by the Scoring Model to calculate the scores for email messages based on types of messages (original, forward, or reply). The results of the Scoring Model are used to determine important messages and important people. Some experiments were carried out to verify the methodology and the results showed that this model's result is acceptable. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Information Management, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 2009 Electronic mail systems Transaction systems (Computer systems) Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B03183 http://203.159.5.9/ait-thesis/detail.php?q=B03183 091111 20260817162542.0