[Exim] Hi.. DB lookup question..

for my host_accept_relay I have a perl program (poprelayd) writing to a db
(created by using makemap hash popip </dev/null)

My question is how do I get exim to lookup the db file properly?

Is this correct?

host_accept_relay = xxx.xxx.xxx.xxx/x : net32-dbm;
/usr/exim/relaydb/popip.db