On Mon, 1 Aug 2022 at 23:33, <post...@ptld.com> wrote:
>
> > Hi,
> > Does your Private address 192.168.x.x have a default gateway as well?
> > Rgds/DP
>
> No, the gateway is left blank on that interface. The private interfaces are 
> just cabled together via a switch.
>
> In systemd:
>     [ipv4]
>     address1=192.168.0.200/24
>     may-fail=true
>     method=manual

Hi,
Then Postfix should not make any attempt to deliver mail using the
private address since it doesn't have a network route to deliver the
mail through that interface anyways.
Rgds/DP

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