HOW do I make this SPAMMER GO AWAY

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2012-10-24 22:08:17 [1662] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:17 [1675] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:19 [1697] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:20 [1706] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:20 [1714] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:34 [1799] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:48 [1936] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:49 [1944] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:49 [1953] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:50 [1963] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:51 [1973] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:51 [1985] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:52 [1996] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:53 [2006] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:54 [2019] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:54 [2028] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:55 [2038] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:55 [2049] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:56 [2057] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:56 [2067] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:57 [2087] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:08:58 [2097] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -flucas_bridges@squid4duck.org
2012-10-24 22:12:33 [5530] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -fadmin@squid4duck.org
2012-10-24 22:12:37 [5560] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -fadmin@squid4duck.org
2012-10-24 22:14:05 [7394] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -fadmin@squid4duck.org
2012-10-24 22:14:19 [7485] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:14:28 [7552] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:14:34 [7614] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:14:50 [7741] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:15:20 [8506] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:15:33 [8640] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:15:42 [8729] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:15:53 [8825] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org
2012-10-24 22:16:02 [8925] cwd=/home/squid/public_html 4 args: /usr/sbin/sendmail -t -i -foliver_hensley@squid4duck.org

If it's your server install fail2ban.

It works great!