All binary (and source) artifacts are available via Maven Central.
The project groupId is org.apache.james and the artifact names are:
Just include something like this in your pom.xml
<dependencies> <dependency> <groupId>org.apache.james</groupId> <artifactId>apache-mailet-api</artifactId> <version>2.5.0</version> </dependency> <!-- other dependencies --> </dependencies>
To learn how to write your own mailets please have a look at Generic Matcher and Generic Mailet.
Another good learning source are the unit tests from Standard Mailets