The message transfer agent was usually a single node.
消息代理节点如果不可靠，将直接影响到消息的传递。
Nodes in the distributed system often transfer asynchronous message through the message transfer agent.
分布式系统中节点之间的异步消息传递常通过消息传输代理进行。
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。
For example, if you look at the log produced by the postfix mail transfer agent (MTA), you can see that the information for a single message is spread over a number of lines (see Listing 1).
例如，如果您查看由postfixmailtransfer agent (MTA)产生的日志，那么您可以看到，每一条消息的信息分布在多行内容中(请参见清单1)。
For example, if you look at the log produced by the postfix mail transfer agent (MTA), you can see that the information for a single message is spread over a number of lines (see Listing 1).
例如，如果您查看由postfixmailtransfer agent (MTA)产生的日志，那么您可以看到，每一条消息的信息分布在多行内容中(请参见清单1)。
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