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I route all gateways to a hardware firewall. &nbsp;I think I may be able to configure the DNS of the mail server (which I have onsite) to use the DSL router, and configure the DNS that all clients use to go through the cable modem.<br />
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I'll give it a shot.
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I route all gateways to a hardware firewall.  I think I may be able to configure the DNS of the mail server (which I have onsite) to use the DSL router, and configure the DNS that all clients use to go through the cable modem.

I'll give it a shot.

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Ah but using the DNS of one ISP, and having the gateway set to the other firewall will still make the traffic flow out through the first, and may actually cause problems, since many ISPs don't allow DNS queries from outside their network. You'll have to change the gateway I think. 
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Ah but using the DNS of one ISP, and having the gateway set to the other firewall will still make the traffic flow out through the first, and may actually cause problems, since many ISPs don't allow DNS queries from outside their network. You'll have to change the gateway I think.

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I need resources and instructions for speeding up and configuring NAT for Windows 2000 Servers (website URLs preferred).<br />
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My problem is that I have 2 Internet connections and 2 routers. &nbsp;I would like all incoming and outgoing SMTP traffic to go through a DSL connection; any other Internet Trafiic I want to go through a cable connection. &nbsp;
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I need resources and instructions for speeding up and configuring NAT for Windows 2000 Servers (website URLs preferred).

My problem is that I have 2 Internet connections and 2 routers.  I would like all incoming and outgoing SMTP traffic to go through a DSL connection; any other Internet Trafiic I want to go through a cable connection.  

NAT for Windows 2000 Server

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.