求翻译：除了浪费别人的时间和不必要的电子邮件、垃圾邮件也消耗了大量的网络带宽。因此,有许多组织以及个人,他已经在自己对抗垃圾邮件与各种技巧。但因为互联网是公共的,有非常小的,可以采取防止垃圾邮件,就像它是不可能阻止垃圾邮件。然而,一些在线服务制定政策来防止垃圾邮件发送者从垃圾邮件用户。是什么意思？

In addition to waste other people's time and unnecessary e-mail, spam also consumes a lot of network bandwidth. Therefore, there are many organizations and individuals, he has to fight spam with a variety of skills. However, because the Internet is a public, very small, you can take to prevent spam,