I was able to get postage building and running with maven 3 based on the changes I proposed in postage-22. The artifacts below are in the /stage/org.apache.james/jars directory in the postage project. I manually added them to my m3 repository.
I believe we will need to refactor in order to fully align postage with J3. It would be great to see postage running regularly as part of a build against J3. - Drew
