We have two different internet ISPs connected to one Cisco ASA Firewall (8.3). I would like to allow inbound traffic from two public IP address, one from ISP1 and other from ISP2, to the same MX server on dmz. We need receive email on both two public ips for MX load balance. We not want to configure ASA Dual ISP failover. We need to have the two ISP working actively.