Please Help

[Bhavesh Shah]

Hi,
 I would like to have an exim help :
I would like to modify following condition so that it will do file lookup which has list of emails to reject  instead f ONE mail specified in below condition.
Basically my main goal is to reject mails which is intended for certain recepients.
condition = "\
             ${if eq {$local_part@$domain}{account at host.domain}{yes}{no}}"
 
How can i achieve this?
Please Help.
Thanks Bhavesh