[Dovecot] Dovecot Quota Configuration

Hi,

I setting up a Mail server for my company.  I have installed Postfix, it

is working fine. I have installed Dovecot IMAP Server, i want to know how to implement quotas for users mailbox. I have created Users using /etc/passwd, No Mysql or LDAP at present. can you provide me the links to do this.

Regards, P. Prasanna