>> So in the case of a timeout, things may slow down, waiting on 
>> the timeout, and in the case of nxdomain things should 
>> immediately fail.  
>> Neither of those cases should impact blocking or scoring 
>> though. Is that correct?
 
> It seems to me that in the past, there were instances of dead lists
> answering in the positive for every query months after the list had been
> "closed", in order to get mail admins to stop querying that IP space.
> Admins who were still mistakingly using the list found all incoming mail
> blocked.

Right, that's one of the risks; then there are others, for example imagine
the list non being mantained, an IP (now clean) gets blocked since it was
not removed from the list; also, since in SORBS case the list is "on sale"
before trusting it again it would be a good idea knowing "who" will buy
it and then make a decision


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