I have big problem in my LAN network. Each day we get more Virus mails from one of the PC in out LAN network. we have around 50PCs. The virus comes from Some one PCs Address book. We cant find that one running the Antivirus Softwares.
Any one have any idea hiow to find the computer which one sends mails in network. Any good networking software is available?
Else please give me some idea how to find the IP which one sends mail each minutes.