Garbage mail from exchange server

  • From: "Navneet Rastogi" <navneet.rastogi@xxxxxxxxxxxxx>
  • To: exchangelist@xxxxxxxxxxxxx
  • Date: Fri, 30 Sep 2005 21:25:35 -0600

I have installed exchange 2003 and installed group shield on it 
My problem is 
Exchsnge server randomly picks up some name from Global access List and
send some mails to different others users. After getting these mails users
complaint that we did not send this mail what should I do
I know this is due to the virus but how to clean the system pl. suggest

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