The Java Apache Project has released the Java Apache Mail Enterprise Server (JAMES) 2.3.1. It's a 100% pure Java Mail Server which introduces Mailets. The idea is to do for email what servlets do for the Web. You can use maillets to automatically process and reply to email messages using the full power of Java. 2.3.1 is mostly a bug fix release. James is published under the Apache 2.0 license.