电子邮件的发明,让人们的沟通更高效,联系更紧密。但在商业利益驱动下,互联网上批量发送的垃圾邮件正泛滥成灾。未经收信人同意,以商业广告等为主要内容的垃圾邮件经常猝不及防地塞满邮箱,甚至阻断了互联网。联合国组织机构国际电信联盟估计,截至2004年7月,全球80%的电子邮件信 The invention of e-mail, so that people’s communication more efficient and more closely linked. However, driven by commercial interests, mass spam sent over the Internet is rampant. Without the consent of the recipient, commercial advertisements and other content as the main content of spam is often caught off guard filled mailbox, and even blocked the Internet. The UN organization, the International Telecommunication Union, estimates that as of July 2004, 80% of the global e-mail messages