Security Basics mailing list archives
RE: Protecting an Exchange server?
From: "Depp, Dennis M." <deppdm () ornl gov>
Date: Fri, 14 May 2004 18:52:55 -0400
Joe, I think Mark had it correct the first time. It is not a good practice to allow traffic from the internet to go directly to your internal network. Having an intermediary in front of the firewall is the best bet. Of course a better solution would be to have two firewalls. One to protect your email gateway from the internet and the other to protect your internal network. Denny -----Original Message----- From: Joe Polk [mailto:listuser () javelinux com] Sent: Friday, May 14, 2004 2:08 PM To: Mark G. Spencer; security-basics () securityfocus com Subject: Re: Protecting an Exchange server? You actually would want this: Internet -> Firewall -> Email gateway -> Exchange In this scenerio, a port is opened on the Firewall to the gateway. This, in Exchange terms, is called a "smart host" setup. You could easily do this with another SMTP server, say like Sendmail on a Linux server, so that all mail crosses that server. This has not only the advantage you are looking for, but also the ability to use RBL/SBL spam protection and you could even add SpamAssassin to it. Of course, you could use an appliance too. <<JAV>> ---------- Original Message ----------- From: "Mark G. Spencer" <mspencer () evidentdata com> To: <security-basics () securityfocus com> Sent: Thu, 13 May 2004 10:51:56 -0700 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 ---------------------------------------------------------------------- ----- 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:
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------- End of Original Message ------- ------------------------------------------------------------------------ --- 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 ------------------------------------------------------------------------ ---- --------------------------------------------------------------------------- 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:
- Re: Protecting an Exchange server?, (continued)
- Re: Protecting an Exchange server? Michael Gale (May 18)
- Re: Protecting an Exchange server? Michael Gale (May 17)
- Re: Protecting an Exchange server? Jamie Pratt (May 18)
- Protecting an Exchange server? bob martin (May 14)
- RE: Protecting an Exchange server? Depp, Dennis M. (May 14)
- RE: Protecting an Exchange server? Micro Kluge (May 14)
- RE: Protecting an Exchange server? Michael Dunn (May 14)
- RE: Protecting an Exchange server? Hunt, Jim (May 14)
- RE: Protecting an Exchange server? Randy Johnson (May 20)
- Re: Protecting an Exchange server? Ed Budd (May 21)
- RE: Protecting an Exchange server? Randy Johnson (May 20)
- RE: Protecting an Exchange server? Depp, Dennis M. (May 17)
- RE: Protecting an Exchange server? Peter Mueller (May 17)
- RE: Protecting an Exchange server? Jose Enrique Diaz Jolly (May 17)
- Re: Protecting an Exchange server? Depp, Dennis M. (May 18)
- RE: Protecting an Exchange server? Chris Santerre (May 18)
- RE: Protecting an Exchange server? Jose Enrique Diaz Jolly (May 25)
- RE: Protecting an Exchange server? Jose Enrique Diaz Jolly (May 25)