Firewall design question (NAT Port Forward)

[c-mu]

Hi!
I have a shot question:

For example is the following Port forward rule is given:

Interface: WAN
Proto: TCP
Source: ANY
Ports: ANY
Destination: 43.1.1.1 (fantasy IP but in real a public IP that i own)
Ports: 25
NAT: internal MX Server IP
Ports: 25

Do I also have to create a Firewall Rule, or is that done automatically but not visible in the rules section for this interface (WAN)?

Thank you!

[c-mu]

Oh Sorry. I see now, it creates automatically a suitable rule for that Interface.

I have so much rules, that I didn't saw that!