https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6724

--- Comment #19 from D. Stussy <[email protected]> 
2011-12-13 21:26:59 UTC ---
"... hold off on subsequent DNSBL queries for 1 hour."

I just made a suggestion to the authors of the above cited draft, and in my
suggestion, I indicated that perhaps queries to the offending DNS-based list be
disabled until reconfiguration or manual restart without a time limit.  We
don't know what time quantum the list maintainer may hae selected over which to
determine excessive queries or even if such is a constant (vs. lengthened
periods for each time a query source is blocked, including "permanently"). 
Although one hour may be reasonable for a "first" test after detecting a
problem, maybe subsequent retries after continued failure should be much later.
 In that respect, I suggest starting with 1 hour, but then add half the time
for each subsequent failure, producing a series:  1, 1.5, 2.25, 3.375, 5.0625,
....

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