E2K External DNS Servers?

E2K External DNS Servers?

Post by bWNyb2 » Fri, 29 Apr 2005 06:05:41


We have a single AD domain environment. We have split-brain DNS: internal
W2K DNS servers to support AD and external DNS servers so people can find us
on the Internet.
On the Exchange SMTP Virtual Server properties sheet, on the Delivery tab,
behind the Advanced button there is an option to "Configure external DNS
servers".
My understanding of this parameter is that if I do not configure it,
Exchange uses the same DNS servers specified in the configuration for the
NIC. If I do configure it, I can specify different DNS servers for Exchange
to use. Is my understanding correct?
Is the advantage of specifying external DNS servers that the Exchange
servers will not query my internal DNS servers for Internet-based MX records
(hosts)?
What is the best practice for this configuration parameter?

Thanks in advance for the help.
 
 
 

E2K External DNS Servers?

Post by Lanwench [ » Tue, 03 May 2005 00:02:52


Yes.


Yes.


AFAIK, if you aren't having problems, or there's no especial need for you to
use different DNS servers for Exchange, leave it be.

 
 
 

E2K External DNS Servers?

Post by bWNyb2 » Tue, 03 May 2005 23:28:11

Thanks for the reply. I am thinking about all the NDRs we are sending to
spammers and the resulting DNS queries. Just wanted to make sure I
understand my options.
Thanks for the brainpower.
 
 
 

E2K External DNS Servers?

Post by Lanwench [ » Wed, 04 May 2005 14:54:04


Having Exchange use different DNS servers to resolve names for *outbound*
mail won't have anything to do with spam, NDRs, etc....


No prob. If you're getting a ton of spam, get something that can keep it
from getting to your server in the first place. SpamAssassin, GFI,
www.postini.com - there are many options.

In addition, see www.vamsoft.com for the Open Relay Filter, which is a swell
thing.
 
 
 

E2K External DNS Servers?

Post by TWVjSU » Sat, 02 Jul 2005 02:56:09

That was a great question I wish someone would have answered your question.