Server being used to send spam.

Hello,

I have had this problem for a long time but now it is getting worse.
Someone is using my server to send email and it is not coming from my server. Someone else is using my server to send out spam and that spam is getting thrown in my Mail Queue. I have around 300000 mails in the queue. Is there anything I can do to block this. I have looked around and cannot find the solution. Even my server load is around 10. Here is the TOP command preview:

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Tasks: 151 total, 1 running, 145 sleeping, 3 stopped, 2 zombie
Cpu(s): 19.1% us, 6.7% sy, 0.0% ni, 14.6% id, 58.4% wa, 0.0% hi, 1.1% si
Mem: 514356k total, 499580k used, 14776k free, 28352k buffers
Swap: 2562328k total, 35544k used, 2526784k free, 81632k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9608 mailnull 16 0 11176 3524 2584 S 7.9 0.7 0:00.04 exim
9640 mailnull 16 0 11856 3520 2580 S 7.9 0.7 0:00.04 exim
9636 mailnull 18 0 11852 3460 2560 D 5.9 0.7 0:00.03 exim
9642 root 16 0 11360 3364 2484 D 5.9 0.7 0:00.03 exim
29393 mailnull 18 0 14872 9124 1272 D 2.0 1.8 0:02.23 exim
1 root 15 0 3636 476 448 S 0.0 0.1 1:04.41 init
2 root RT 0 0 0 0 S 0.0 0.0 0:02.14 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:00.07 ksoftirqd/0
4 root RT 0 0 0 0 S 0.0 0.0 0:02.08 migration/1
5 root 34 19 0 0 0 S 0.0 0.0 0:00.09 ksoftirqd/1
6 root 5 -10 0 0 0 S 0.0 0.0 0:00.07 events/0
7 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/1
8 root 6 -10 0 0 0 S 0.0 0.0 0:00.00 khelper
9 root 15 -10 0 0 0 S 0.0 0.0 0:00.00 kacpid
29 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/0
30 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/1
40 root 15 0 0 0 0 S 0.0 0.0 0:12.00 pdflush



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Thank you.

 

 

 

 

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