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A mail transfer agent such as Sendmail 8.7 or later.
一个邮件传输代理，比如Sendmail 8.7或者更高的版本。
youdao
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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。
youdao
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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。
youdao