how to prevent from port scan attack

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    Hi All ,

    We are using SBS 2000 server , now when i am checking my event log , security log i am receiving the message that all port scan attack is detected by ip x.x.x.x , now how can i stop all this port scan attack , its 5 times in a day , as we are using exchange also on the same server , how can i improve mail security , as sometimes i am receiving mail from [email protected] ( Random mail id to my company mail id ) that you have purchased this things etc..and even i dont know receipant or not even sent any mails ever to them , so how can i stop this things also …as i have stop telnet service to protect the misuse from out side ..but as we are using live ip and using mail service on this ip …so how can i improve the security on this situation…


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