cidr map for a certain receiver address only?

[tobi]

Hello list

I wonder if it's somehow possible to block client ips from a cidr map 
for a certain receiver address only. I have some addresses for which I 
do not want clients from certain providers to send mail to. With a cidr 
map in smtpd_client_restrictions I affect all addresses on my server, 
which is not my intention ;-)
Would it be possible to define this via a postfix policy or something 
similar? My goal would be to get a cidr map that would only be used when 
certain receiver addresses occur during smtp dialog.

Thanks for any hint

tobi