Gateway for all domain

[Alessandro Lazzini]

Hi all,
I would like make a email gateway total transparent for many smtp server.
my scenario is:
Internet-->ROUTER   - - - - - > SERVER1        (example 10.0.0.20)
                       | - - - - - - - - - > SERVER2        (example
10.0.0.21)
                       | - - - - - - - - - > SERVER3        (example
10.0.0.22)
                       | - - - - - - - - - > SERVER4        (example
10.0.0.23)
                       | - - - - - - - - - > MAILSCANNER (example 10.0.0.6)

My router redirect email traffic to mailscanner with iptables like this:
 iptables -t nat -A PREROUTING -p tcp -d 10.0.0.20/30 --dport 25 -i eth0 -j
DNAT --to-destination 10.0.0.6
 The problem of this scenario is update and know all domain for accept relay
in mailscanner gateway configuration.
Somebody know the way in sendmail configuration for relay all domain that
resolved his mx on ip address of smtp server?
Sorry for my bad english.

Regards,

A. Lazzini

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