各报文传送代理(MTA)合作完成存储转发的报文传送功能。
Message transfer agents (MTAs) cooperate to perform the store-and-forward message transfer function.
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 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 interaction by which an originating user agent transfers to a message transfer agent the contents of a message plus the submission envelope.
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