Need help on tcpsvd

Dear sir,
           I had installed qmail and presently i'm using tcpserver for
listening smtp connections and for sending mails . I need to switch to
tcpsvd from tcpserver.

I had encountered some problem when switching to tcpsvd for
qmail-smtpd , i could send mails thru' command line like

telnet 202.144.28.164 25
Trying 202.144.28.164...
Connected to 202.144.28.164.
Escape character is '^]'.
220 mail.tenet.res.in ESMTP
mail from: [email protected]
250 ok
rcpt to: [email protected]
250 ok
data
354 go ahead
heelllo test
.
250 ok 1108796016 qp 4611
quit
221 mail.tenet.res.in
Connection closed by foreign host.

But when i tried to send thru any mail client , it's repeatedly asking
for password but never authenticate.

What might be the problem, can anyone help me to solve this problem.


exec tcpsvd -vv -t1800 \
   -c100 -C'10:421 per host concurrency limit reached\r\n' \
   202.144.28.164 25 \
   /var/qmail/bin/qmail-smtpd \
   /var/qmail/bin/checkpassword /bin/true 2>&1


Using Tcpserver:

exec /Programs/Daemontools/0.76/bin/softlimit -m 4000000              
                 \
     /usr/local/ucspi-tcp/bin/tcpserver -HDRv -l `head -1
/Programs/Qmail/1.03/control/me`   \
     -x /Programs/Qmail/1.03/control/tcprules-smtp.cdb -c 40          
                \
     -u `id -u qmaild` -g `id -g qmaild` 0 25                                 \
     /var/qmail/bin/qmail-smtpd /var/qmail/bin/checkpassword /bin/true 2>&1


But I had successfully switched for pop3 server using tcpsvd and it
works fine. It authenticates the password correctly using the same
checkpassword program.

Sincerely,
S.Rajkumar