Security Basics mailing list archives
Re: Protecting an Exchange server?
From: Ned Fleming <ned () kaw us>
Date: Fri, 14 May 2004 12:44:48 -0500
On Thu, 13 May 2004 10:51:56 -0700, "Mark G. Spencer" <mspencer () evidentdata com> wrote:
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?
Windows only? Sure, there's no doubt $$$ something. If you're willing to dip your toe into open source, I recommend postfix running on FreeBSD (or on Linux). Total cost: the price of the PC -- and the time you spend installing and configuring it, which may not be insubstantial. It's not overwhelming (I did it), but if you've never administered Linux or FreeBSD, well, you might want to start elsewhere. http://www.linuxjournal.com/article.php?sid=4241 It's not an appliance, per se, but pretty close.
Basically, I don't want my Exchange server to be accessible to the world in any way.
Excellent idea.
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?
You won't set up a route. Instead, you'll point your DNS MX record to the box on the DMZ. Then you'll set up a transport map on the DMZ box that points to your internal Exchange box. Note: "transport map" is the terminology postfix uses; you might see it listed as a "smarthost." You'll also point your Exchange box to the DMZ box as its "smarthost."
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.
Hmmm. Are you wanting to make your users' email accounts available to them outside your network? If so, that's a separate story. --------------------------------------------------------------------------- Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off any course! All of our class sizes are guaranteed to be 10 students or less to facilitate one-on-one interaction with one of our expert instructors. Attend a course taught by an expert instructor with years of in-the-field pen testing experience in our state of the art hacking lab. Master the skills of an Ethical Hacker to better assess the security of your organization. Visit us at: http://www.infosecinstitute.com/courses/ethical_hacking_training.html ----------------------------------------------------------------------------
Current thread:
- Protecting an Exchange server? Mark G. Spencer (May 14)
- Re: Protecting an Exchange server? Ned Fleming (May 14)
- Re: Protecting an Exchange server? Kelly Martin (May 14)
- SMS gateway server GSM modems` Nitin Nair (May 17)
- RE: Protecting an Exchange server? Sanjay K. Patel (May 14)
- Re: Protecting an Exchange server? Joe Polk (May 14)
- RE: Protecting an Exchange server? Kurt (May 14)
- Re: Protecting an Exchange server? Niek (May 14)
- Re: Protecting an Exchange server? Brian Keefer (May 17)
- Re: Protecting an Exchange server? Barrie Dempster (May 17)
- Re: Protecting an Exchange server? Michael Gale (May 18)
- Re: Protecting an Exchange server? Michael Gale (May 17)
(Thread continues...)