One approach towards reducing electronic junk, including spam in e-mail and on the Web, is to assign a small cost to the act of sending mail, or posting information on a Web site.

减少电子垃圾（包括电子邮件和 Web 上的垃圾信息）的一种方式是给发送邮件或在 Web 站点发布信息的行为加上一些成本。

youdao

And if you identify a piece of mail in the Junk folder that isn't actually spam, Hotmail remembers this and sorts differently in the future.

不过，如果你发现垃圾邮件(Junk)文件夹里有一封被误杀的邮件，Hotmail会记住你的选择，下次就会区别对待。

youdao

Spam is the worst form of junk mail and a typical reason why many people have to change their email addresses.

滥发垃圾邮件是最坏的形式和典型的原因很多人要改变自己的电子邮件地址。

youdao

Non-profit Spamhaus maintains what are known as "block lists" which many organisations use to spot sources of spam and other junk mail to stop them clogging mail servers and inboxes with unwanted messages.

BBC: Dutchman arrested over huge web attack

MessageLabs, the email-filtering company that Symantec acquired in 2008, posted a set of word maps today measuring the frequency of terms in spam emails from a random one-week sampling of junk mail pulled from the most prolific spam-spewing botnets.

FORBES: The Most Common Words In Spam Email

The prevalence of junk mail and spam has certainly made weeding out noise more difficult over the last decade.

FORBES: Ignore Your Mail And Lose Thousands of Dollars