【单选题】【消耗次数：1】
有关电子邮件代理，描述不正确的是( )
①
SMTP是一种“存储转发”协议，适合于进行代理
②
SMTP代理可以运行在堡垒主机上
③
内部邮件服务器通过SMTP服务，可直接访问外部因特网邮件服务器，而不必经过堡垒主机
④
在堡垒主机上运行代理服务器时，将所有发往这个域的内部主机的邮件先引导到堡垒主机上
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相关题目
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在堡垒主机上，我们需要关闭或保留一些服务，以下做法中哪个是错误的：
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如果我们不需要该服务，则将它关闭
②
如果我们不了解该服务的功能，可将其打开
③
如果我们将该服务关闭后引起系统运行问题，则再将它打
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关于堡垒主机的说法，错误的是：
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设计和构筑堡垒主机时应使堡垒主机尽可能简单
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堡垒主机的速度应尽可能快
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