Ok, I've paid a subscription to see if your setup on Ubuntu 10.4 / ISPConfig 3 has the same email alias problem that I have on my setup. (http://www.howtoforge.com/forums/showthread.php?t=47255
However, after downloading the vmware image, I find that the disk is reported as faulty. I've downloaded it twice with the same results.
Any chance of a fixed version?