[exim] greylisting again and whitelist entries

Hi All,

I've configured Exim 4.50 for greylisting like
http://theinternetco.net/projects/exim/greylist .

It seems works fine but I want to add whitelist to exclude from
greylist checking _using_exim_. Who can advise how to do it in better way?

Here is something like draft using whitelist from:
http://cvs.puremagic.com/viewcvs/*checkout*/greylisting/schema/whitelist_ip.txt

I've created
hostlist exclude_greycheck = 12.107.209.250 : 63.82.37.110 : \
                             205.188.139.137 : 207.171.168.0/24

My suggestions is, in case I add

accept hosts = +exclude_greycheck

before greylist checking.. It will work but not in the best way.
In this case server will be open relay for specified addresses, right?

Is there any way to make behavour like this:
"In case $sender_host_address listed in hostlist exclude_greycheck,
then SKIP greylisting testing and go ahead to test against next
conditions like user/domain checks etc.."

Any ideas? Or am I mistaken? Thanks