logging of wrong passwords or usernames

"Chand ." <[email protected]> Wed, 22 Mar 2006 01:11:03 -0500
Newsgroups gmane.comp.djb.checkpassword
Message-ID <[email protected]>
Dear all,
            I have installed qmail pop3d as per instructions in 
lifewithqmail. But when my users type incorrect password, it is not showing 
up anything in the /var/log/maillog.

           How do I configure it so that when a user types wrong password, 
it is then logged in /var/log/maillog ??


Thanking you

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