然而，使用电子邮件的话，你的邮件信息在传输的过程中可能会被拦截，而你却一无所知。
With e-mail, however, your message could be intercepted midstream, and you might never realize it.
文本匹配-所有邮件包含定义词组会被拦截。
Text match - all messages that contain a defined phrase will be blocked.
文本匹配-所有邮件包含定义词组会被拦截。
Text match - all messages that contain a defined phrase will be blocked.
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