Set hard quota per domain.

Hello,

I am trying to set up vpopmail, qmailadmin and vqadmin so that I can 
programmatically add a domain and a set amount of Mb of quota for the full 
domain.
I've tried playing with the configuration setting in vpopmail of 
enable-domain-quotas but then the qmailadmin and the vqadmin do nothing to 
check the quota for the domain.
The postmaster in qmailadmin just seems to create accounts as large as 
they wish.

The set number of users, lists and forwarders works perfect.  But I can 
not seem to get the maximum quota to work.

Is there a link or document that explains this?

Thanks for any help,
-Steve