Exchange Problem

I discover one user sec@mydomain.com not include Active Directory send mail with attach virus to all user in mydomain.com. Please help me fix problem.
Thanks everyone
-My Exchange system running Exchange 20003 Enterprise Edition with Frontend and Backend Technologies. Backend Server not install Anivirus. The Frontend Server install Symantec Antivirus Symantec 10.0.1.1000
-All user in my company can't send mail to AOL. I try contact AOL but always deny by AOL.How to contact AOL open my domain send mail to AOL.
-I want install GFI Antivus on the Backend Server. Please give me admonition or help me choose antivirus application for Backend Server

Thanks for any help
namtpAsked:
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life_jCommented:
Create an SMTP connector when trying to send email to AOL.

http://www.amset.info/exchange/smtp-connector.asp

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namtpAuthor Commented:
I've config SMTP connector when i install Exchange, All Exchange User can sent mail to anywhere but can't send mail to AOL.
Thanks life j
rakeshmiglaniCommented:
Check the following article

Cannot send mail to AOL, Qwest, Hotmail, Earthlink, etc
http://support.microsoft.com/kb/924235/en-us
life_jCommented:
You need to create a smtp connector with the smart host as your ISP so that your email wouldn't be blocked by AOL.
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