RES: RE: RES: RE: Multiple SMTP relay servers - Pos sible Solution?

  • From: "Tiago de Aviz" <Tiago@xxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Wed, 21 Jul 2004 17:23:52 -0300

(Just thinking loud)

 

Point the IIS smart host to a DNS name and use round robin?

 

Tiago de Aviz

SoftSell

(41) 340-2363

www.softsell.com.br <http://www.softsell.com.br/> 

 

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  _____  

De: Chris Wall [mailto:Chris.Wall@xxxxxxxxxxxxxxxxxxx] 
Enviada em: quarta-feira, 21 de julho de 2004 17:06
Para: [ExchangeList]
Assunto: [exchangelist] RE: RES: RE: Multiple SMTP relay servers - Pos sible 
Solution?

 

http://www.MSExchange.org/

I plan on using one of the GFI relay servers as a primary (all services running 
such as whitelisting, Bayesian, DNS Lookup, Virus Scanning, Keyword and 
Attachment blocks, etc...) the other server will only be configured to use 
keyword blocks, attachment blocks and virus scanning.  This is only for 
failover purposes so the secondary does not have to be as restrictive.  I look 
at it this way - it is better to have too much e-mail coming into the 
organization than none at all, as long as it is being scanned for virus', 
attachment types and some keywords.  

 

So far, for my overall solution I have this:

 

Set the internal Exchange servers (with IMS running) to use internal DNS to 
deliver mail to the weighted MX records pointing to GFI SMTP Virtual Servers in 
the DMZ.  Then the GFI SMTP Virtual Servers will reference external DNS for 
final external mail delivery....

 

Now I have to find a way for internal mail to have redundancy.  Using IIS 6 or 
5 on the SMTP Virtual Servers in the DMZ, I need to find a way to have them 
deliver to either of the internal Exchange servers in case the primary IMS is 
not available on one of the Exchange servers.  I have received several 
responses telling me to have the SMTP Virtual Servers deliver mail using DNS.  
I can not do this as the SMTP Virtual Servers are pointing to an external DNS 
server.  Can I set Smart Hosts on the SMTP Virtual Servers to send mail to two 
IP address in IIS?  If not, I have a single point of failure for mail coming 
into my organization if the Smart Host fails...

 

If I can specify two IP's in the IIS Smart Host field for my domain (for 
example [172.16.1.1; 172.16.1.2] )  would this work?  Or is this not possible 
in IIS?

 

Very confused now and I cant find anything that states I can set 2 IP's in the 
IIS Smart Host field.

 

  _____  

From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] 
Sent: Wednesday, July 21, 2004 3:47 PM
To: [ExchangeList]
Subject: [exchangelist] RE: RES: RE: Multiple SMTP relay servers

http://www.MSExchange.org/

Hi Tiago,

 

Good point! One location I worked with had 4 relays! One for MailEssentials, 
one for MailSecurity, One for iHateSpam and one for SpamAssisin. All inbound 
mail was run through all four relays before hitting the corporate Exchange 
Servers. Turned out to work pretty good and very few false positives and very 
little spam got it.

 

I'll need to write up the configuration some day at www.msexchange.org.

 

Thanks!

Tom
www.isaserver.org/shinder <http://www.isaserver.org/shinder> 
Get the book!
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7> 
MVP -- ISA Firewalls


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