毕业设计(外文翻译).docx

郑州大学毕业设计（文献翻译）题 目：简单邮件传输协议服务扩展的认证机制指导教师： 宋伟 职称：副教授 学生姓名：×××学号：12345678909专业：计算机科学与技术院（系）：信息工程学院完成时间：2012 年 5 月 15 日2012 年5月15日外文文献资料SMTP Service Extension for AuthenticationThis document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the Internet Official Protocol Standards (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.There are usually two operating modes: SMTP to send and receive SMTP. Specific way: to send SMTP mail in the received user request to determine whether this e-mail local mail, if sent to the users mailbox direct investment, or to check the remote mail server dns MX record, and the establishment of the remote received a two-way between the SMTP transmission channel, then by the sending SMTP command issued by the receiving SMTP to receive, and answer the counter-side delivery. Once the transmission channel is established, SMTP MAIL command specifying the sender sends the message sender. If the recipient can receive mail SMTP OK response is returned. SMTP RCPT command issued for the sender to confirm whether the message is received. If the SMTP recipient receives, it returns OK response; if you cannot receive, then refused to accept response to issue (but does not suspend operation of the entire message), the two sides will repeat so many times. When the recipients receive all messages will receive a special sequence, if the recipient of the message successfully processed, it returns OK response.SMTP commands define the mail transfer or by user-defined system functions. Its command is CRLF End of the string. In the case with parameters, the command itself is SP and the parameters separately, if not directly, and with parameters CRLF Connection. Mailbox syntax and receiving sites must be consistent with the form. SMTP commands and responses are discussed below. S