postfix-Dovecot-IMAP-Squirrel mail Problem

[dhaneshk k]

  Help please :I configured & testing postfix,dovecot-IMAP ,postfixadmin , maia-mailguard ,squirrelmail in a production box(freeBSD-6.2), few issues when I use squirrel mail.
  by using postfix admin I created virtual domains and mailboxes for the virtual domains , by using this I can log in to squirrel mail , but when I compose a mail & sending , its not going to any mailboxes that in any virtual domains that I created?
 why  this  ?


My LOG FILES showing  tail /var/log/maillog


Oct 26 15:59:38 sun dovecot: IMAP(dhanesh at cdacchn.in): Disconnected: Logged out
Oct 26 15:59:39 sun dovecot: imap-login: Login: user=, method=PLAIN, rip=232.195.5.1, lip=232.129.195.5.1, TLS
Oct 26 15:59:39 sun dovecot: IMAP(dhanesh at cdacchn.in): Disconnected: Logged out

another user I tried 

Oct 26 15:58:52 sun dovecot: imap-login: Login: user=, method=PLAIN, rip=232.195.5.1, lip=232.195.5.1, TLS
Oct 26 15:58:52 sun dovecot: IMAP(eru1 at sxxw.net): Disconnected: Logged out
Oct 26 15:58:52 sun dovecot: imap-login: Login: user=, method=PLAIN, rip=232.195.5.1, lip=232.195.5.1, TLS
Oct 26 15:58:52 sun dovecot: IMAP(eru1 at sxxw.net): Disconnected: Logged out
Oct 26 15:58:53 sun dovecot: imap-login: Login: user=, method=PLAIN, rip=232.195.5.1, lip=232.195.5.1, TLS
Oct 26 15:58:53 sun dovecot: IMAP(eru1 at sxxw.net): Disconnected: Logged out


Q:2  How can I map the real users(normal users in this server box that I created using the useradd  command ) with squirrelmail so they can login to squirrelmail and send & receive mail  

Pls help me with your  suggestions 
_________________________________________________________________
Check out some new online services at Windows Live Ideas—so new they haven’t even been officially released yet.
http://www.msnspecials.in/windowslive/