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。
The User-Agent request-header field contains information about the user agent originating the request.
User-Agent请求标头字段包含有关发出该请求的用户代理的信息。
The User-Agent request-header field contains information about the user agent originating the request.
User-Agent请求标头字段包含有关发出该请求的用户代理的信息。
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