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.

This release includes versions of the JavaMail API implementation, IMAP,MTP, and POP3 service providers, some examples, and documentation for the JavaMail API. Please see the FAQ at http://java.sun.com/products/javamail/FAQ.html-This release

Yawebmail 源码，一个网页邮件收发系统-Yawebmail is a Web-(Online-)Application that enables you to establish a SMTP-, POP3- or IMAP-Connection, even if you are behind a firewall that prevents Mail-Communication- you only need to have HTTP-Access to the Internet.

java email server with support for SMTP, POP3 and IMAP protocols