如果没有对代理进行适当地配置，那么当试图导入时将会对用户显示出错误消息，如图17所示。

If the agent is not properly configured, an error message will be displayed to the user when attempting the import, as shown in figure 17.

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使用定制代理的一个常见场景是名称查找，其中SAP用户可以以SAP用户ID的形式在进入的消息中呈现出来。

One common scenario for using custom agents is name lookups, where SAP users can be represented in an incoming message with their SAP user IDs.

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邮件传输代理从另一个邮件传输代理、邮件用户代理或邮件提交代理处接收消息。

The mail transfer agent receives the messages from another mail transfer agent, a mail user agent, or a mail submission agent.

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