同时，所有网络服务商应该建立一个电子邮件地址身份系统(有两个好的标准，域名密钥和存储保护特征)。
At the same time, all ISPs should implement an E-mail ID system (there are two good standards, called Domain Keys and SPF).
本文从网络结构、域名系统到邮件系统以及DNS服务器的设置，简要介绍了如何构建学校网的电子邮件系统。
The paper describes briefly the ways to construct campus email system in the light of the configuration of DNS server and network construction, domain name system and email system.
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