[CentOS] About Postfix mail server using dovecot and courier imap configuration

Dear Friends,

I am new in server side so i want to configure new  Postfix mail server
using dovecot or courier imap configuration . But I want courier for
configure server . I do not want any database for store mails and users
information. It just like create users then all mail goes to users home
folder. Like useradd /home/jiten/ then all mail store in my jiten folders.

Please help me it is urgent for me.

-- 
Regards
Jitendra Jha