Shuttle cards have been used to increase interactive class communication. The cards enable us to take students\u27 attendance, opinions, questions and etc. They also are useful for a teacher in charge to check students\u27 level of understanding of topics, answer some of their questions in the next class session, and make supplementary web pages to satisfy their questions. However, recently, almost all students possess their own mobile phones. As a result, they have been used possibility as the means for education. So, we asked students their opinions on using mobile mails for attendance check and other functions instead of the shuttle cards. Naturally, many students were positive, but some were strongly negative for the reason that they feel insecure not knowing whether the teacher had received their mobile mail or not. To ease their anxiety, we implemented an auto replying system to inform the students that the teacher had checked their attendance. The system will also collect their messages, and deliver them to the teacher electronically. For this system, students are requested to send a password which has been given to them in the classroom. As a result, the teacher is able to take accurate attendance of the class. Thus, this new mobile mail system has become an effective tool for the teacher to create quick and convenient interactive class communication, replacing the function of the shuttle cards
