电子邮件已经成为人们日常生活的一部分,从撰写邮件、发送邮件到接收邮件都可以在邮件服务商给出的简明环境下完成,不用关心具体的细节.然而,邮件从发出到邮件传输,一直到目的地被接收,实质上是一个比较复杂的过程.%E-mail has become pan of everyday life, the process from composing a message, sending an email to receiving messages can be completed in a concise environment presented by e-mail service while the specific details need not careful. However, the process that the message sending from message transfer to the destination is very complicated essentially.
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