Hi Oliver,
1. To forward some ports from WAN (WAN IP configured on the physical port) we need to configure port forwarding only and Access rule if you need to allow and block some Public IP's
2. To forward some ports from WAN (second IP from the Public IP's giving by ISP ) in that case we need to configure one to one NAT to the internal server and you can choose which port to redirect in our case we can choose port 80 , from WebGUI you cannot forward more than port to the same internal IP, so to forward the rest of needed port (20,21,25 ...) please follow this steps :
Step 1 : after adding One To One NAT we need to configure Access rule : allow from WAN to LAN , choose the service (port 25) to internal server and there is an option in the bottom CheckBox "Use other WAN (internet) IP address, check the box and put your second public IP, and the same for the rest of the port.
Please let me know after your testing
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Greetings
Mehdi