What can be done if server is open relay for spammer ??

Hello ALL,
I have already posted the spammer blocking query but Now I found that this from relay testing service that my server can was used for relaying messages!!

I took test and the last line posted as :
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Hmmn, at first glance, host appeared to accept a message for relay.
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What can be done for this? How do I stop this?
THank you...

 

 

 

 

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