How to block an IP from accessing the server?

I had a spammer in my server and I want to block an IP that I think can help to stop.

All the thousands messages has this IP:
200.168.62.55


How can I block in root?


Thanks
-------------------------------
1BNZrZ-0003wB-G5-H
root 0 0
<awormuth@baesse.de>
1084291933 0
-helo_name mail2.monaco.net
-host_address 200.168.62.55.1344
-host_name 200-168-62-55.dsl.telesp.net.br
-interface_address 69.56.xxx.xxx.25
-received_protocol esmtp
-body_linecount 25
-deliver_firsttime
XX
6
laura.isabella@ey.com
laura.kreofsky@ey.com
laura.lane@ey.com
laura.maloon@ey.com
laura.mendoza@ey.com
laura.montgomery@ey.com

188P Received: from 200-168-62-55.dsl.telesp.net.br ([200.168.62.55] helo=mail2.monaco.net)
by server4.x*********** with esmtp (Exim 4.24)
id 1BNZrZ-0003wB-G5; Tue, 11 May 2004 13:12:14 -0300
035F From: "Ellen" <awormuth@baesse.de>
052T To: "laura.isabella@ey.com" <laura.isabella@ey.com>
073 Subject: Take control of your finances with Quicken DLX 2004 xdcywam
038 Date: Tue, 11 May 2004 12:11:54 -0400
045 Content-Type: text/plain; charset="us-ascii"
032 Content-Transfer-Encoding: 7bit
052I Message-Id: <E1BNZrZ-0003wB-G5@server4.x***********>

 

 

 

 

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