WAN rule works, floating not

[flaz]

Hi all,

I'm facing this strange problem on a fresh installation of pfSense version 2.3.1_1.

I have two WAN:

WAN_1 192.168.201.0/24 is the default gateway
WAN_2 192.168.9.0/24 is the one used for all incoming traffic

No traffic shaping, balancing, ect.

LAN is 192.168.1.0/24

SMTP in is allowed on both interfaces.
I have two NATs, one for each interface, with the relative firewall rule.

I had to setup a manual Outbout NAT to replace source IP address for the traffic coming from the WAN_2 interface.

If I disable both firewall rules and create a new floating rule:

Action : Pass
Quick : yes | no (doesn't matter, i tryed both)
Interface: WAN_1 and WAN_2
Direction : in | any (doesn't matter, tryed both)
Famili : IPv4
Protocol : TCP
Source : any
Destination : any port 25

When connecting using the WAN_1 public address everything works fine.
When using the WAN_2 address I can't connect.

Enabling log on the rule I can see that the traffic is allowed, the seems like the Outbound NAT is not having effect.

To me it all seems correct, am I missing something?

Thank you in advance.