exclude a client from internal_networks

[Gary V]

I failed to find an example where a client or clients can be excluded from a 
network that is configured in internal_networks. Some stupid NAT boxes proxy 
the mail so it appears to come from that host. I would like to include the 
internal network in internal_networks, but exclude that host. I would post 
what I think it would obviously be, but would rather get the real answer 
rather than a guess from me.

Gary V
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