[isalist] Re: SMTP Outbound from different IP addresses
- From: "Jerry Young" <jerrygyoungii@xxxxxxxxx>
- To: isalist@xxxxxxxxxxxxx
- Date: Tue, 4 Mar 2008 07:36:01 -0500
I think this was for outbound traffic, not inbound.
How would you ensure that the IP address ISA used to send mail to the
Internet changed? I can't think of any way it could; unless it can do a
one-to-one NAT.
A non-ISA server solution is available, though.
Three mail gateways with external interfaces on them are used in the mail
traffic path both inbound and outbound. ISA could then sit between them.
Would require 3 MX records, though, and some modification of the Exchange
SMTP Connector (assuming Exchange inside) to use the mail gateways as smart
hosts.
Mail flow would then go Internet -> Mail Gateways -> ISA -> Exchange for
inbound and Exchange -> ISA -> Mail Gateways -> Internet for outbound.
Could get more clever with load balancing on either side but I figured less
complexity with this example would help make it easier to understand. :)
On Tue, Mar 4, 2008 at 5:45 AM, Han Valk <Han.Valk@xxxxxxxxxxxxxxx> wrote:
> http://www.ISAserver.org <http://www.isaserver.org/>
> -------------------------------------------------------
>
> Why not? Configure 3 different IP addresses on the external NIC. Configure
> 3
> different SMTP server publishing rules each pointing to different IP
> address
> on the external NIC.
>
> ________________________________
>
> From: isalist-bounce@xxxxxxxxxxxxx on behalf of Thomas W Shinder
> Sent: Mon 3/3/2008 6:06 PM
> To: isalist@xxxxxxxxxxxxx
> Subject: [isalist] Re: SMTP Outbound from different IP addresses
>
>
> Hi Rob,
>
> That would be a nice feature. But no, you can't do that.
>
> Thomas W Shinder, M.D.
> Site: www.isaserver.org <http://www.isaserver.org/>
> Blog: http://blogs.isaserver.org/shinder/
> Book: http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7>
> MVP -- Microsoft Firewalls (ISA)
>
>
>
>
> ________________________________
>
> From: isalist-bounce@xxxxxxxxxxxxx
> [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Rob Moore
> Sent: Monday, March 03, 2008 10:47 AM
> To: isalist@xxxxxxxxxxxxx
> Subject: [isalist] SMTP Outbound from different IP addresses
>
>
> Hello all-
>
> ISA 2006 Standard.
>
> I'm guessing this is a fairly simple question. Hope so, anyway.
>
> We have three servers that do SMTP outbound. Is there a way to have
> each one send SMTP traffic from a different IP address on our one ISA
> server?
> I'd like to isolate them to different IP addresses so when one gets
> blacklisted (as happened over the weekend) they don't all get blacklisted.
>
> Thanks,
> Rob
>
>
>
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--
Cordially yours,
Jerry G. Young II
Microsoft Certified Systems Engineer
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