Sending Mail out through a specific Internet Connection

7 Jun 2006 6:37 PM

David P

We have a standard SBS2003 box setup to route email via our ISP. Our lan is
connected via a router in nat mode and we have a firewall.
The exchange server has a def gateway of our firewall which then passes
traffic to the router and the internet in turn.
Email comes in from the outside via an MX record setup and is routed
directly to the Exchange host.
Our users are sending too many emails out via the exhcnage server and the
single intenret connection is grinding to a halt.
If we get another static ISP link (router/firewall) and assign it an ip
address on my lan, how can we tell Exchange to send mail out via this route.

Alternatively, I read up on having a smart host on my lan, which my exhcnage
server is sconfigured to route mail to (Send out via Smarthost) and this can
have a default gateway of the 2nd ISP router and therefore it will then send
mail out, but what can I use on this so called 2nd box to provide the SMTP
smarthost sending email service.

Ideas would be greatly appreciated.

9 Jun 2006 7:15 PM

Mark Arnold [MVP]

On Wed, 7 Jun 2006 11:37:04 -0700, David P
<Dav***@discussions.microsoft.com> wrote:

Show quote

>We have a standard SBS2003 box setup to route email via our ISP. Our lan is
>connected via a router in nat mode and we have a firewall.
>The exchange server has a def gateway of our firewall which then passes
>traffic to the router and the internet in turn.
>Email comes in from the outside via an MX record setup and is routed
>directly to the Exchange host.
>Our users are sending too many emails out via the exhcnage server and the
>single intenret connection is grinding to a halt.
>If we get another static ISP link (router/firewall) and assign it an ip
>address on my lan, how can we tell Exchange to send mail out via this route.
>
>Alternatively, I read up on having a smart host on my lan, which my exhcnage
>server is sconfigured to route mail to (Send out via Smarthost) and this can
>have a default gateway of the 2nd ISP router and therefore it will then send
>mail out, but what can I use on this so called 2nd box to provide the SMTP
>smarthost sending email service.
>
>Ideas would be greatly appreciated.

Common sense tells you to get the network boys to route all SMTP
traffic out through a given IF on the gateway (IF0 / IF1, whatever)

A perfectly sensible other way would be to use a Smarthost on your SBS
server (I assume you don't also have a Windows 2003 Member server with
Exchange on it?) and specify the host name of the ISP's SMTP relay.

12 Jun 2006 6:53 AM

Marcel

Show quote

"David P" <Dav***@discussions.microsoft.com> schreef in bericht
news:8C8F1960-FD49-44AE-9672-404820EEAD24@microsoft.com...
> We have a standard SBS2003 box setup to route email via our ISP. Our lan
> is
> connected via a router in nat mode and we have a firewall.
> The exchange server has a def gateway of our firewall which then passes
> traffic to the router and the internet in turn.
> Email comes in from the outside via an MX record setup and is routed
> directly to the Exchange host.
> Our users are sending too many emails out via the exhcnage server and the
> single intenret connection is grinding to a halt.
> If we get another static ISP link (router/firewall) and assign it an ip
> address on my lan, how can we tell Exchange to send mail out via this
> route.
>
> Alternatively, I read up on having a smart host on my lan, which my
> exhcnage
> server is sconfigured to route mail to (Send out via Smarthost) and this
> can
> have a default gateway of the 2nd ISP router and therefore it will then
> send
> mail out, but what can I use on this so called 2nd box to provide the SMTP
> smarthost sending email service.
>
> Ideas would be greatly appreciated.

Quite simple.

Define a smarthost and look up it's IP. Place the hostname and ip in your
hosts file

-or-

Define a smarthost and look up all of it's IPs.

For both cases, define a static route for those IPs:

route add -p "ip-address smarthost" MASK 255.255.255.255 "ip adress router
to second isp" METRIC 1

Interesting for you?