User Message Agent 用户消息代理
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.
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。
The UAS initiates the closing by sending a BYE message over the same route that the acknowledgement came over and the other user agent acknowledges this message by sending a 200 OK response.
UAS 将通过确认信息所经过的相同路由发送一个 BYE 消息，从而发起关闭操作，另一个用户代理将发送一个 200 OK 响应来确认此消息。
The interaction by which an originating user agent transfers to a message transfer agent the contents of a message plus the submission envelope.
一种交互操作，借此发起用户代理将报文的内容加托付信封传送给报文传送代理。
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