电子邮件传递可以由多种协议来实现。目前，在Internet 网上最流行的三种电子邮件协议是SMTP、POP3 和 IMAP，-can send e-mail from multiple protocols is to be achieved. Currently, the Internet's most popular e-mail agreement is three SMTP, POP3 and IMAP.

网络课程的实验题目,用Java实现SMTP和POP3 协议,要求有界面-network of experimental curriculum subjects using Java SMTP and POP3 calling interface