Server returing mails

I have Several Sites running on My Dedicated Server and On The Same Server have my mail Server Configured, from past week I have been receiveing returning mails from Various Sites Complaining that My server Sent Mails to their anf their server has returned the mails cause of my Mails being Infeced with Virus.

I never sent mails let alone returning them blaming being Infected With Virus.. . Is Any one Else Getting the Same or is it really Infected with Virus Although I have Norton Isntalled on it

 

 

 

 

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