Mail server being heavily used for Spam

I am getting lots of Returned mail: User unknown for the past few days with some usernames which i don't have on my system. my site is using class.phpmailer.php mailer for some mail delivery and i just replaced the file with the latest relase but still being used for spam.
I am not sure if i have the access to fix the problem since i only WHM access to the server.

Please advice.

Thanks


Received: from lccqsc (host70.255.123.216.in-addr.arpa [216.123.255.70]) by rly-ya02.mx.aol.com (v97.10) with ESMTP id MAILRELAYINYA21-14140097ce0c6; Sat, 17 Jan 2004 13:20:20 -0500
From: Nikki <Anjanettencswitp@myDomain.com>
Reply-To: <Anjanettencswitp@myDomain.com>
To: <BuCcMaN27@aol.com>, <Buckapsig@aol.com>, <BUCKARO101@aol.com>,
<Buckaroo196513@aol.com>, <Buckaroo408@aol.com>,
<Buckaroo7541@aol.com>, <Buckaroobanzai71@aol.com>,
<Buckaroobrad2@aol.com>, <Buckaroo@aol.com>, <BuckarooRT@aol.com>,
<BuckAZZman95@aol.com>, <BuckBabe36@aol.com>
Subject: H0l1day b1lls adding up?
Date: Sat, 17 Jan 2004 13:19:31 -0500
Message-Id: <mesejef@myDomain.com>
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="rrturxfaojeqq_1074363613"
X-AOL-IP: 216.123.255.70
X-AOL-SCOLL-SCORE: 0:XXX:XX
X-AOL-SCOLL-URL_COUNT: 0


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Received: from jfcnoh (pmc-hpizarro.pmchile.cl [200.72.0.104]) by rly-xm03.mx.aol.com (v97.10) with ESMTP id MAILRELAYINXM32-5fc40097d319d; Sat, 17 Jan 2004 13:21:52 -0500
From: Melina <Cherishptklneswdnxnr@mydomain.com>
Reply-To: <Cherishptklneswdnxnr@mydomain.com>
To: <Lumag87@aol.com>, <Lunap112@aol.com>, <LUNAQUEEN@aol.com>,
<Lunar7989@aol.com>, <Lunarblue1117@aol.com>, <Lunar@aol.com>,
<Lunaria8@aol.com>, <LunaRodriguez@aol.com>
Subject: L00se w31ght f33l great
Date: Sat, 17 Jan 2004 13:24:48 -0500
Message-Id: <noqhotporx@mydomain.com>
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="efgiybubmbm_1074363895"
X-AOL-IP: 200.72.0.104
X-AOL-SCOLL-SCORE: 0:XXX:XX
X-AOL-SCOLL-URL_COUNT: 0

 

 

 

 

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