We currently have two internet connections to our site. One DSL and one T1. The DSL line is used for all web and ftp traffic. The T1 line is used for e-mail only traffic.
We currently have a netgear dual WAN router that acts as the firewall for both the T1 and DSL line. On the LAN side, this router has only one IP address. We use protocol binding so that all SMTP traffic is routed out through the T1 line from our e-mail server. All other traffic is on the DSL line.
We wish to upgrade this netgear router with a Cisco ASA5505 to handle the DSL line and a PIX 501 on the T1 line. When we do this, we are going to have multiple gateways. The e-mail server is the only server that is going to need access to the T1 line. The problem is I would like webmail to go through DSL.
Is it possible to have e-mail traffic go through the T1 and have incoming webmail traffic come in through the DSL? Additionally, I would like outgoing web traffic from this server (Windows updates, web browser, etc.) go through the DSL line.