Creating master user for Dovecot

This is based on the the dovecot wiki - http://wiki.dovecot.org/Authentication/MasterUsers

The ff: will be added or appended at /etc/dovecot and for this, am using dovecot-1.0.7-2.el5


#
auth_master_user_separator=*
#
auth default {
#
 passdb passwd-file {
        args = /etc/dovecot/passwd.masterusers
        master = yes
        }
#


and the entry for  /etc/dovecot/passwd.masterusers contains the ff: 

#/etc/dovecot/passwd.masterusers
 
master:{plain}mypassword
#

So testing if it works, telnet the server.

telnet servertest.com 143


[user@servertest ~]$ telnet servertest.com 143
Trying servertest.com...
Connected to servertest.com.
Escape character is '^]'.
* OK Dovecot ready.
a login username*master mypassword
a OK Logged in.


When using imap client, the username that will be use is username*master.