【摘要】 SMTP是电子邮件传输的标准方法 ,提供了一种可靠的、有效的传输机制 ,但当连接不可靠及发送的数据比较大或网络传输比较慢等其他情况发生时 ,为了提高效率 ,我们就应该考虑SMTP的服务扩展 .本文从最简单的典型的SMTP交换出发 ,分析研究了SMTP的工作原理及其服务扩展 ,并重点讨论了SMTP对检查点和命令流水的服务扩展更多还原

【Abstract】 As a standard way for e_mail transformation,SMTP provides a reliable and effective mechanic for transformation,when the connection is not stable or for other reasons,however,we should consider the service expansion of SMTP.The paper discusses the working principle and its service expansion of SMTP ,with the focus on the study of the expansion of the point checking and etc.更多还原