[exim] dns_again_means_nonexist

I'm a little confused - I have *dns_again_means_nonexist set to * but I
still get defers over and over on IP addresses that won't look up.

deny    message     = No RDNS and Blacklisted in 
$dnslist_domain=$dnslist_value - $dnslist_text
         acl = aux_secondary_blacklist
    !verify     = reverse_host_lookup

Trying to get around the defer = thanks in advance.

*