qmail-pop3d cannot accept pop3 connection from remote host

Hi,

I am facing a problem here: my qmail-pop3d cannot accept pop3 connection from remote host.

When I perform "telnet localhost 110" in my linux machine, I can login to my pop3 qmail account.

However, when I tried "telnet my.qmail.server 110" I got a connection refused error. 

I wonder what could be the problem.

This is the "ps -ef | grep mail" output form the email server:
[root@mail /root]# ps -ef | grep mail
root       219   211  0  2002 ?        00:00:00 supervise qmail-send
root       221   211  0  2002 ?        00:00:00 supervise qmail-smtpd
root       225   211  0  2002 ?        00:00:00 supervise vmailmgrd
qmaill     227   222  0  2002 ?        00:00:02 /usr/local/bin/multilog t /var/l
qmaill     230   220  0  2002 ?        00:00:03 /usr/local/bin/multilog t /var/l
root       240   226  0  2002 ?        00:00:00 multilog t /var/log/vmailmgrd
root       241   211  0  2002 ?        00:00:00 supervise qmail-pop3d
qmaill     249   242  0  2002 ?        00:00:02 /usr/local/bin/multilog t /var/l
qmails    9150   219  0 Apr12 ?        00:05:34 qmail-send
qmaild    9153   221  0 Apr12 ?        00:00:01 /usr/local/bin/tcpserver -v -R -
root      9162  9150  0 Apr12 ?        00:00:00 qmail-lspawn ./Maildir
qmailr    9163  9150  0 Apr12 ?        00:00:00 qmail-rspawn
qmailq    9164  9150  0 Apr12 ?        00:00:00 qmail-clean


Thanks in advance!

Whatever