[Exim] wanna ground specific mails from specific hosts

Hi List,

what i want to do is the following:
i have some internally used mail adresses (like helpdesk and trouble ticket)
which gets lot of spam. So i want to redirect all mails send to this
specific adresses and not comming from internal ips to dev/null.

What i have till now:

fh_grounded:
driver = accept
transport = spam_delivery
condition =${lookup{$local_part@$domain}lsearch{/etc/exim/fh-luh-grounded}}

that sends all mails listed in /etc/exim/fh-luh-grounded to my spam_devivery
transport. But the good mails also. So i need some "if mail is not comming
from mynet/24" condition also.

any ideas appreciated

regards Martin

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