电子邮件已经成为人们日常生活中通信、交流的重要手段之一,但垃圾邮件问题也日益严峻,网民平均每天收到的垃圾邮件数量已超过了正常邮件。因此目前反垃圾邮件技术的研究成为了一个热门的话题。文中介绍了基于安全认证、规则匹配和统计学习三类邮件过滤技术及应用情况,分析了过滤技术面临的挑战并指出垃圾邮件过滤的发展趋势。 E-mail has become one of the most important means of communication and communication in daily life. However, the problem of spam is also becoming more and more serious. The average daily number of spammers received by netizens exceeds the number of normal e-mails. Therefore, the current anti-spam technology research has become a hot topic. This paper introduces three types of mail filtering technology based on security authentication, rule matching and statistical learning, and analyzes the challenges faced by the filtering technology and points out the development trend of spam filtering.