RE: Protecting an Exchange server?

["Hunt, Jim" <Jim.Hunt () nwsc k12 in us>]

You can place a second Exchange Server in the DMZ just to relay mail and
act as an Outlook Web Access interface.

Alternately, you can use third party SMTP server to forward mail.  GFI
Mail Essentials has a SPAM filter that will run on a Windows Server and
filter and forward email to an internal Exchange server and is
reasonable priced.  

Jim Hunt
Network Services Manager
Northwestern School Corporation


-----Original Message-----
From: Mark G. Spencer [mailto:mspencer () evidentdata com] 
Sent: Thursday, May 13, 2004 12:52 PM
To: security-basics () securityfocus com
Subject: Protecting an Exchange server?

Hello,

I'm wondering if there is any way to locate an Exchange server on my
internal network and place some kind of email appliance on our DMZ to
actually send and receive email to the world and to the Exchange server
on
my internal network?

Basically, I don't want my Exchange server to be accessible to the world
in
any way.

So ..

Internet -> My Email Appliance -> Firewall -> Exchange Server

I envision setting up a dedicated route in the firewall between the
email
appliance out on the Internet and my Exchange server behind the firewall
on
my local network?

Are there any email appliances that can work with Exchange in this way?
It's my (limited) understanding that Exchange server can't "pop" to
another
email server to pull each Exchange users email, so I'm not sure exactly
how
or if my plan could be put into action.

Thanks,

Mark





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