I have followed Falko's tutorial http://www.howtoforge.com/virtual-us...l-ubuntu-12.10
The interestting part was to have user quotas.
Then, without a though I ran apt-get upgrade and this upgraded my patched Postfix. Ooops.
Now, every time I restart Postfix, I get these warnings that "....warning: /etc/postfix/main.cf: unused parameter: virtual_overquota_bounce=yes.....
I am afraid I messed up the quota patch. Any suggestions?