For example, the Connection Filter agent rejects any message that is sent from an IP address that is on a real-time block list (RBL).

例如，连接筛选器代理将拒绝从实时阻止列表（RBL）中的IP地址所发送的任何邮件。

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In addition, a task agent can be used to filter messages sent to the MDB by specifying a message selector.

此外，任务代理还可以用于通过指定消息选择器对发送到MDB的消息进行筛选。

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Inside Rails, you want to be able to identify an iPhone user agent in the ApplicationController for eventual use in a before filter.

在Rails内部，您需要能够在ApplicationController中识别iPhone用户代理以便最终在before过滤器中使用。

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