https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6048





--- Comment #20 from Steve Freegard <[email protected]>  2009-01-22 
07:51:22 PST ---
(In reply to comment #19)
> (In reply to comment #17)
> > (In reply to comment #14)
> > 
> > > So it isn't clear that a really high score will get administrator 
> > > attention
> > > sufficiently quickly. 
> > 
> > If all mail being tagged doesn't get their attention quickly, I'm not sure 
> > what
> > will. I can't think of anything SA can do that would get attention faster.
> 
> I don't know if that is appropriate at all.  Bear in mind that in some
> situations, a sufficiently high score would result in the mail being bounced! 
> If going over a URIBL query limit results in all mail coming in to your site
> bouncing, that's a very serious problem. :(

Yes - this is exactly the reason I raised this bug.  The behaviour is unique to
URIBL and I have AlexB's assurances that deliberate positive results for all
queries is rarer that I think it is (as I've been hit by this collateral damage
several times now).

> I would be in favour of a well-known test endpoint: "blocked.multi.uribl.com".
> for most queries that would return "0.0.0.0" with a long TTL.  for sites
> blocked due to too many queries, that would return "255.255.255.255" with a
> long TTL.  These are very cacheable and would be extremely low-load.  This
> provides a way for clients like SA to query and determine if a caller is
> overloading the servers; in that situation we can issue warnings, fire
> informational rules, log stuff to the syslogs etc.

There is already a BCP proposal for this:

http://www.ietf.org/internet-drafts/draft-irtf-asrg-bcp-blacklists-05.txt

   Note: In Section 3.4 it is noted that some DNSBLs have shut down in
   such a way to list all of the Internet.  Further, in Section 3.5,
   DNSBL operators MUST NOT list 127.0.0.1.  Therefore, a positive
   listing for 127.0.0.1 SHOULD be interpretable as an indicator that
   the DNSBL has started listing the world and is non-functional.

Although this paragraph is about shutting down a DNSBL; it is in essence
exactly what URIBL are trying to achieve on a querying IP level - so I believe
the same applies.


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