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I am worried someone has installed a script on my server, I have changed the root password but it seems to have not helped
I get the messages
Hi. This is the qmail-send program at ks304582.kimsufi.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
22.214.171.124 failed after I sent the message.
Remote host said: 554 delivery error: dd This user doesn't have a yahoo.co.uk account ()  - mta1040.mail.ukl.yahoo.com
--- Below this line is a copy of the message.
Received: (qmail 17839 invoked by uid 0); 13 Jan 2011 09:33:48 +0000
Date: 13 Jan 2011 09:33:48 +0000
In my mail box, It seems someone using my server to send spam.
I will also need a version of cacti totally removed and perhaps a free server scanner or similar if one is available to scan in future for such trojans, scripts etc