Cannot resolve PTR record for

#R$*          $: < $&{client_resolve} > 
#R<TEMP>          $#TEMP $@ 4.4.0 $: "450 Relaying temporarily denied. Cannot resolve PTR record for " $&{client_addr} 
#R<FORGED>        $#error $@ 5.7.1 $: "550 Relaying denied. IP name possibly forged " $&{client_name} 
#R<FAIL>          $#error $@ 5.7.1 $: "550 Relaying denied. IP name lookup failed " $&{client_name}