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 18:31:23 -0300
Well, i guess the correct would be: your IIS uses its own DNS server, put a
secondary zone of your internal domain, and set it to forward to external DNS's
in the DNS Server properties.
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 17:47
Para: [ExchangeList]
Assunto: [exchangelist] RE: RES: RE: Multiple SMTP relay servers - Pos sible
Solution?
http://www.MSExchange.org/
One last stupid question --
In IIS, since the server is set to use an external DNS server, should I just
type in the FQDN of the internal DNS server or its IP in []'s where it asks for
the Smart Host information? I assume that I can not simply select the 'Use
DNS' radio button.
Sorry to be so stupid on this, but I am confused on how to get the IIS to point
back into the internal DNS since it is setup to reference the External DNS
server in the TCP/IP settings of the NIC.
Enough hand holding... Time to experiment in the lab I guess. Thanks for all
of the info and suggestions. I will be open to any other suggestions though :)
_____
From: Lara, Greg [mailto:GLara@xxxxxxx]
Sent: Wednesday, July 21, 2004 4:16 PM
To: [ExchangeList]
Subject: [exchangelist] RE: RES: RE: Multiple SMTP relay servers - Pos sible
Solution?
http://www.MSExchange.org/
Chris, you don't need to point your relay to both IMCs, you get get the same
effect you want by using round-robin entries in DNS. Create two host entries
with the same name, each one pointing to a different Exchange server. The DNS
server will return alternate IP addresses with each query. Then, point your
SMTP relay to that hostname.
Greg Lara
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_____
From: Chris Wall [mailto:Chris.Wall@xxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, July 21, 2004 4:06 PM
To: [ExchangeList]
Subject: [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
Tenha proteção contra vírus e spam para seu servidor de correio pagando
apenas uma pequena mensalidade! Veja os serviços de Gateway em
www.softsell.com.br !
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