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The Apache Java Enterprise Mail Server (a.k.a. Apache James) is a 100% pure Java SMTP, IMAP, JMAP and POP3 Mail server. We have 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.

The Java JDK includes various means of creating/consuming compressed files. What is missing is easy way of creating lazy streamed zip archive, in spirit of java.util.zip.DeflaterInputStream. This implementation relies on the fact that the PKZIP specification allows archiving data streams of sizes not known upfront. This implies that the archives produced will be readable only by tools aware of this trick. Notably, java.util.zip.ZipInputStream is OK with that, so we use it to test compatibility.