An anti-spam method against sophisticated techniques

作为反垃圾邮件方法，频繁使用基于用于广告、网络钓鱼等的URL（目标URL）的过滤技术。 然而，最近，为了避免这种技术，垃圾邮件发送者使用复杂的对策，如频繁改变目标URL。 因此，需要一种新的方法来对抗这种对策。 在本研究中，我们建立了一个反垃圾邮件的方法，基本上是不可伪造的特征，如注册日期的域名在一个目标URL，域名系统（DNS）服务器的行为相关的目标URL，等等。

As an anti-spam method, a filtering technology based on URLs for advertisement, phishing, and so on (target URLs) is frequently used. Recently, however, to avoid this technology, spammers use a sophisticated countermeasure such as frequent change of target URLs. Therefore, a new method against this countermeasure is required. In this research, we established an anti-spam method based on basically unforgeable characteristics such as the registration date of the domain in a target URL, the behavior of the DNS (Domain Name System) server of the domain related to the target URL, and so on.