Why my server send out spam virus emails?

Why my server send out spam virus emails? I saw one of my email account send a lot spam emails to anoth email account of mine. The virus inside the emails are W32.Blackmal.E@mm!enc.
http://securityresponse.symantec.com....cgi?vid=35818

My server OS is centos 3.5. I don't know what's wrong with my server. Why my server send out spam virus emails?

 

 

 

 

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