I disabled postfix via webmin "bootup and shutdown", but it is still shown as active in the virtualmin "system information" section. I clicked on refresh and I also clicked on the "stop" button, but it is still shown as "on" (but webmin shows it as "off"). I also clicked on the "stop" button in webmin -> postfix server, but doesn't work either.
What could be wrong (this is a fresh 12.04 virtualmin gpl install).
By the wat, you could probably add 12.04 to the "OS dropdown list" here in the ticket system now :-)