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由于ＩＭＡＰ４协议在很多方面优于ＰＯＰ３，越来越多的邮件服务器软件开始支持ＩＭＡＰ４．文章在分析了目前Ｉｎｔｅｒｎｅｔ电子邮件发送和接收的原理以及相应网络协议的基础上，设计并实现了一个支持ＩＭＡＰ４协议的电子邮件客户程序．
As the IMAP4 protocol outperforms POP3 in many ways, more and more mail server software is beginning to support IMAP4. Based on the analysis of the principle of Internet e-mail sending and receiving and the corresponding network protocols, the article designs and implements an e-mail client program that supports IMAP4 protocol.