using Sendmail when I send mail to any of the hotmail accout it says following error in my maillogs

Apr 6 08:04:51 server123 sendmail[28581]: l36F4ngg028579: to=<>, ctladdr=<> (0/0), delay=00:00:02, xdelay=00:00:02, mailer=esmtp, pri=120292, [], dsn=2.0.0, stat=Sent ( <200704061504.l36F4jHL028568@server123.linuxwebadm> Queued mail for delivery)

I can easily send mail to all other account.

Any help?