名词
中文翻译：Unknown
同义词：
['spam', 'spam email', 'junk mail']
例句：
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1. The company's policy prohibits the use of greenmail to solicit donations.
该公司的政策禁止使用绿色邮件来索要捐款。
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2. He received a warning for sending greenmail to his colleagues.
他因发送绿色邮件给同事而收到警告。
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3. The greenmail campaign has been banned by the internet service provider.
该互联网服务提供商已禁止绿色邮件活动。