dual stack rbl

[Benny Pedersen]

how will postfix handle connections if recipient domains see ip in rbl 
blacklist, will it be trying agin until all ips on recipient domain is 
tryed ?

does it make sense ?
will first reject just win on dual stack ipv4 / ipv6 hostname ?

i ask this since i like to know what to do with that problem, if at all 
anything