The Java Apache Mail Enterprise Server (a.k.a. Apache James) is a 100% pure Java SMTP and POP3 Mail server and NNTP News server. We designed James to be a complete and portable enterprise mail engine solution based on currently available open protocols.
James is also a mail application platform. We have developed a Java API to let you write Java code to process emails that we call the mailet API. A mailet can generate an automatic reply, update a database, prevent spam, build a message archive, or whatever you can imagine. A matcher determines whether your mailet should process an email in the server. The James project hosts the Mailet API, and James provides an implementation of this mail application platform API.
James is based upon the Apache Avalon application framework. (For more information about Avalon, please go to http://avalon.apache.org/)
James requires Java 2 (either JRE 1.3 or 1.4 as of 2.0a3).