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随着Internet的迅速普及,电子邮件以其快捷、方便、低成本的特点逐渐成为人们进行信息交流的主要媒介之一,但是随之而来的垃圾邮件也越来越泛滥。垃圾邮件占用了有限的存储、计算和网络资源,耗费了用户大量的处理时间,影响和干扰了用户的正常工作、生活和学习。如何有效地治理垃圾邮件是全世界共同面临的一道难题,也是互连网上目前有待解决的问题。本文首先介绍了电子邮件对人们日常生活的重要性,然后概要介绍了反垃圾邮件技术的发展历史。研究了三种过滤垃圾邮件的方法,分别是黑白名单技术、主题关键字过滤技术和贝叶斯策略,对这三种技术的设计方法做了说明,重点介绍了贝叶斯过滤技术的设计原理和实现步骤。最后总结了这几种过滤技术的不足之处和设计中遇到的难点问题。
随着Internet的极度膨胀,给人们带来了大量的信息,电子邮件使人们感受到快捷和方便,更已成为一种最快速经济的通信手段,但是互联网又是一个无政府世界,有些人利用电子邮件肆意散发邮件广告,造成很多人的邮箱垃圾成堆,有些人利用电子邮箱制造邮件炸弹,使电子邮件服务器瘫痪;更有甚者利用电子邮件来传播病毒。如此种种给许多用户带来了无尽的困扰。因此对垃圾邮件进行有效的过滤,已经成为了一个有重要意义的现实问题。目前,我国对垃圾邮件过滤研究中语义分析和文本分类方面的技术还比较落后,导致国内很多大型的电子邮件系统无法及时有效地发现和拒绝垃圾邮件,从而给用户造成巨大的伤害。更为严重的是国外很多垃圾邮件制造者利用这一缺陷,通过中国的邮件服务器发送垃圾邮件,致使很多国外ISP服务提供商封锁了中国邮件服务器的IP地址,给中国用户造成很多精神和经济损失。随着中国经济与世界经济的关系日益紧密,中外交