Abstract
In recent years, SPAM email has become big trouble over the Internet. Although some technical countermeasures against SPAM have been proposed, SPAM is still coming eveyday, but when countermeasures are overly sensitive, even legitimate emails will be refused or eliminated. Hence, we propose a new countermeasure that guarantees that legitimate emails will be delivered. Our proposed system can restrain the transfer of SPAM emails only. In this paper, we explain the proposed system and show the result of some experiments.