SMTP Security

From: Az SH (azizab@hotmail.com)
Date: 08/16/02 

From: "Az SH" <azizab@hotmail.com>
Date: Fri, 16 Aug 2002 17:01:51 +0800

I hv firewall between Internet and LAN. My Exchange is NAT in Firewall. I
already disabled Relay in Exchange. But somehow I got mail from hacker
saying that my SMTP server is not secure.

What else can I do to secure it?

Thanks,
Az SH

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