Unauthorized persons can gain access to operating and business secrets when they are sent out through the internal mail system or through external postal services.

当商业秘密经过内部电子邮件系统网或外部邮政投送网发进来时，未经受权的别人能够有时机操作或获取这些秘密。

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Facebook has its own closed, internal E-mail system, for example.

例如，Facebook拥有封闭的内部邮件系统。

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Facebook has its own closed, internal e-mail system, for example.

ECONOMIST: How the threats to the internet��s openness can be averted