[Exim] Well...exim + mysql + relay..problems on lookup the i…

Look:

RCPT to: <gxm@???>
>>> hsru.abdn.ac.uk in local_domains? no (end of list)
>>> hsru.abdn.ac.uk in relay_domains? no (end of list)
>>> looking up host name for 193.70.192.53
>>> IP address lookup yielded smtp3.libero.it
>>> host in host_accept_relay? yes (mysql;select ip from relay_ip)
>>> host is permitted to relay
>>> sender is permitted to relay
250 <gxm@???> is syntactically correct

But when:

RCPT to: <hail@???>
>>> and.kill.com in local_domains? no (end of list)
>>> and.kill.comin relay_domains? no (end of list)
>>> looking up host name for 200.111.199.2
>>> IP address lookup failed
>>> host in host_accept_relay? no (failed to find host name or lookup
deferred)
550 relaying to <hail@???> prohibited by administrator (failed to
find host name from IP address)
LOG: refused relay (host) to <hail@???> from <test@???>
H=(10.10.10.2) [200.111.199.20] (failed to find host name from IP address)

When the ip address lookup fail, it give me errors on host_accept_relay...

How can i stop that ????!!!!