ELECTRONIC MAIL MONITORING DEVICE, TRANSMISSION MAIL SERVER, ELECTRONIC MAIL MONITORING METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To detect transmission of an unsolicited mail more correctly.SOLUTION: From an electronic mail acquired by an acquisition section 101, an extraction section 102 extracts user identification information and communication terminal identification information. A calculation section 103 calculates unique number of the communication terminal identification information for each piece of user identification information extracted. When a verification section 104 determines whether the unique number of the communication terminal identification information for each piece of user identification information calculated exceeds a predetermined threshold value, a notification section 105 makes a predetermined notice to a preset notification destination.