Thanks Wietse, sometimes we want to stretch Postifx like gum beyond limits...
Thanks again, Mr!
Pete.
    On Thursday, October 12, 2023 at 02:32:11 PM GMT+2, Wietse Venema via 
Postfix-users <postfix-users@postfix.org> wrote:  
 
 Pedro David Marco via Postfix-users:
> Hi,
> Postfix documentation states clearly that XFORDWARD is intended for scenarios 
> like this:
> Client -> MTA1-> Content_filter -> MTA2
> And then Content_filter is able to get the IP of Client. Works great!

Only if the filter understands XFORWARD commands.

> But i was wondering... what i chain more MTAs?
> 
> Client -> MTA1 - > MTA2 -> Content_filter -> MTA3
> Is there anyway for Content-filter to keep knowing Client's IP if MTA1 and 
> MTA2 use XFORWARD????

Postfix does not XFORWARD the information that it has received
with XFORWARD. It XFORWARDs the information that it has used for
its own smtpd_mumble_restrictions.

    Wietse
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