| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that data setting and checking processing are required for each of many users and considerable loads and costs are required for the operation of a mail server since the transmission origin of electronic mail is registered for each user in a mail server and mail transmitted from the transmission origin is eliminated in order to prevent junk mail in an electronic mail system. SOLUTION: Received mail messages are stored for fixed time separately for the mail messages of the same text, the integrated value of the number of addresses of the mail message having the same text is held, and if the integrated value exceeds a prescribed value, the mail message is determined as the junk mail and discarded. Thus, the junk mail composed of the mail message having a large amount of the addresses or a large amount of the mail messages having the same contents is efficiently eliminated without performing the data setting and checking processing for the respective users. COPYRIGHT: (C)2004,JPO&NCIPI
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