With the development of the network,people's contact ways are becoming more and more diversified,of which the email is the representative for its convenience and swift.However,junk e-mails are generated,which have been bringing much trouble to the users and the service providers.（这段可以不要）
The junk email can be divided into three types,about the commercial advertisements,the pornographic information,and the rough draft of a document.What's more,the junk emails are all of great harm.The junk emails' makers can send emails to thousands of users per time,making the servers deal with them by spending large amount of time which occupy too much bandwidth,seriously affecting users'regular service.
In order to find the solutions to the junk emails,each service providers try every shift available.Taking the Yahoo China for example,by obeying the "The Internet email serves administration methods",they start using the Spam Guard System to help their users block off the junk emails,which is free for charge and available to automatically do so.
However,fighting against the junk emails can not be done only by the service providers.It is an action,needing all the people to attend with their great efforts.For example,when receiving the junk emails,never delete them conveniently,instead,take down the address and complain it to related department,letting these illegal senders pay the penalty.
自己写的,供楼主参考.
