this case still is not clear for me i will explain current setup
1- 4 router is connected phiscaly to PA and each router provide defrent services (Email , Internet , VPN)
2- PBF are configer for pass the traffice and NAT
3-One defult routur are configer for untrust zone for all services
Our reqiuerment :
1- Shift to 4 router to 1 Fiber line
So -One router.
You no longer need PBF as you only have one route out.
You have 2x incomming SMTP so you need an IP for each on service port [25 & 587]
Everything else does not overlap in terms of service port so can use either of the IP's.
No sub interface is necessary.
Have one interface external with the IP you want to be the primary and nat rules..
Then just have an inbound NAT for the second IP. (Untrust->Untrust)
Thanks @RobinClayton for your advise
I will got from ISP 6 public ip address
Should added the IP to interface !!
and it can be assigned to Zones
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