Identifying Overquota users

[Rajkumar S.]

Hi,

My mail server has many overquota users and all spams send  to them  
are clogging in my send queue, when qmail tried to bounce them back to  
non existing senders. If there is a script that I can use to identify  
overquota users I can run it in a cron and set the  accountStatus of  
such users to disabled and reenable them when they have cleared the  
inbox.

Any better idea to solve this problem is also welcome.

raj