The article introduces the spams definition, harm and sources, explains the solutions to deal with spam, especially the theory of mail filter.

介绍了垃圾邮件的定义、危害和来源，阐述了防范垃圾邮件的几种技术与措施，着重研究探讨了邮件过滤技术的原理及应用。

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That is helping it to filter out the junk: DoCoMo found that 17% of its users were getting up to five spams a day in May 2002, down from 30% a year earlier.

FORBES: Magazine Article