[EXIM] sender_host_reject for dialup?

Is it possible to put a rule in the system filter, central filter, or forward
file that will do a lookup on a hosts file and not process a message if the
host is listed in the hosts file, one like the sender_host_reject option uses?
I want to use this on a dialup, where the usual sender_host_reject option will
not work. I am thinking that the lookup could be performed on the $h_received
header.


thanks

--
Andrew


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