You can block emails from a particular user, or from the entire mail domain (for example, @domain.com).

可以阻止某个用户的邮件，或者阻止来自整个邮件域（例如，@domain.com）的邮件。

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Notice how the mail object defined in the catch block takes a closure that defines the from, to, and message attributes.

注意catch块中定义的mail对象如何接受定义了from、to和message属性的闭包。

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Most schools configured the machines to block e-mail, chat, games and Web sites reached by searching on objectionable key words.

大多数学校在计算机上加入了阻止电子邮件、聊天、游戏和限制关键字搜索网页的配置。

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This week,the United Arab Emirates announced it would block BlackBerry e-mail,web browsing and instant messenger services on October eleventh.

VOA: special.2010.08.06

Cognos, a software company ravaged by the Melissa virus, configured its mail servers to block incoming e-mail attachments exceeding 25KB.

CNN: Protect yourself from the next Melissa

Technology has certainly put postal service mail sorters on the chopping block.

FORBES: Jobs Outlook: Careers Headed For The Trash Pile

He emphasized that Spamhaus doesn't have the power to block e-mail from anyone -- they merely make their data available for service providers and other Web companies to use.

CNN: Massive cyberattack hits Internet users