> I have checked my Server a lot of mails are in queue and those mails  
> are generated from our server and some body use my server and it's  
> happened every weekend. All mails are generated and send to  
> Yahoo,Gmail,Hotmail. I don't know those all senders address and dont  
> have mailbox in server. How do i protect my server. Please help me  
> anyone. 


Open relay? Try http://mxtoolbox.com/diagnostic.aspx and post back the result

regards
nic                                       

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