LinuxQuestions.org - spamcop reporing asa spm

i have configured my centos5.2 server as asmarthost with sendmail 8.13 .
It was working fine. but recipient is not receiving mails. wnen i look the log file tail -f /var/log/maillog i am receiving the following log

Quote:

Dec 24 17:20:28 server2 sendmail[1769]: mBOBoR44001769: from=ilayaraja.soundarajan, size=102, class=0, nrcpts=1, msgid=<200812241150.mBOBoR44001769@server2.avlx.com>, relay=ilayaraja.soundarajan@localhost
Dec 24 17:20:28 server2 sendmail[1770]: mBOBoSZb001770: from=<ilayaraja.soundarajan@server2.xxxx.com>, size=415, class=0, nrcpts=1, msgid=<200812241150.mBOBoR44001769@server2.xxxx.com>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Dec 24 17:20:28 server2 sendmail[1769]: mBOBoR44001769: to=ssilayaraja@gmail.com, ctladdr=ilayaraja.soundarajan (568/568), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=30102, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (mBOBoSZb001770 Message accepted for delivery)
Dec 24 17:20:30 server2 sendmail[1772]: mBOBoSZb001770: to=<ssilayaraja@gmail.com>, ctladdr=<ilayaraja.soundarajan@server2.xxxx.com> (568/568), delay=00:00:02, xdelay=00:00:02, mailer=relay, pri=120415, relay=mail.xxxx.com [216.157.xxx.xx], dsn=4.3.0, stat=Deferred: 451 Blocked - see http://www.spamcop.net/bl.shtml?59.92.xx.xxx

the spam cop is blocking all user's mail

please give solution