It might be worth doing... the thing is, if there is an open relay, it's 
probably getting to you from that open relay (as opposed to going from 
one to another).  Downside though is it makes mail processing a lot 
slower.  If you comment out the DNS related checks in your spool 
processor, generally you'll see a huge increase in performance.  So 
doubling or more the number of checks probably is overkill.  But it 
certainly might be worth having as an option.
-- 
Serge Knystautas
Loki Technologies - Unstoppable Websites
http://www.lokitech.com/

Noel J. Bergman wrote:
> Right now InSpammerBlacklist checks the remote address of the proximate
> relay to see if it is open.  Is that sufficient?  We are trusting that relay
> to filter out e-mail from open relay sources.
> 
> Should we be (at least optionally) checking the entire series, and rejecting
> if we find any open server in the chain?
> 
>       --- Noel




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