Allowing mail from white listed domains

I need to configure our exim MTA to prevent inbound mail to some of
recipients (mailing lists) unless it is coming from specific
domains.

I 've added the following rule to the exim.conf:

----------------------
accept sender_domains = /etc/exim/whitelist.domains

drop
log_message = match recipients_drop.list.
recipients = /etc/exim/recipients_drop.list
---------------------------

Now exim drops inbound mail to recipients in the
recipients_drop.list file. However, it doesn't make any exceptions
for domains in the whitelist.domains file. So inbound mail to the
recipients_drop.list from the whitelisted domains are ALSO being
rejected.

How can I fix this?

TIA