Friends,
I am new to the postfix mail servers. My setup was configured with the below

Mail Server(MTA,MRA) Postfix, Courier-IMAP
Operating System Redhat Enterprise Linux 5.4 .
SPAM Protection/Content Filter IMSS 7.1
DNS,LDAP BIND,OPENLDAP
WebMail Squirrel Mail

Now i need to configure the maildir quota. I need your help and views to achieve this.