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is our server being used to spam, how to fix

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http://forums.cpanel.net – Hi, I got several emails from csf+lfd like this yesterday. Code: Time:  Tue Nov  6 15:09:19 2012 +0800 Type:  RELAY, Remote IP - 66.135.63.177 (US/United States/txserver1.geoestimator.com) Count: 101 emails relayed Blocked: No Sample of the first 10 emails: 2012-11-06 15:00:31 1TVd9B-0002Gd-FQ <= <> H=txserver1.geoestimator.com (server.networkservicesindia.com) [66.135.63.177]:52758 P=esmtps X=TLSv1:AES256-SHA:256 S=15014 id=[email protected] T="Mail delivery failed: returning message to sender" for noreply@our (HowTos)