> I've been using RBLDNS for many years. My setup always is
> block once ip was listed. However, I just notice that it has Neutral.
> What is the difference between DNSBL Failed Score and DNSBL
> Neutral Score?

as Fritz wrote, there's plenty of infos on his site page; at any rate,
ASSP uses a "weighted" DNSBL approach; this means that if
you (e.g.) have something like this

zen.spamhaus.org=>1
bl.spamcop.net=>1
safe.dnsbl.sorbs.net=>1
combined.njabl.org=>1
bogons.cymru.com=>1
ix.dnsbl.manitu.net=>1
dnsbl-1.uceprotect.net=>2
dnsbl-2.uceprotect.net=>2
psbl.surriel.com=>2
l2.apews.org=>3
blackholes.five-ten-sg.com=>3
dnsbl-3.uceprotect.net=>3

and assuming your RBLmaxweight is 50; the above will mean
that

one hit on any list at "level 1" (e.g. spamhaus) will result in a
spamscore increment of 50

one hit on any list at "level 2" (e.g. surriel) will result in a spam
score increment of 25 (50/2)

one hit on any list at "level 3" (e.g. apews) will result in a spam
score increment of 16 (50/3 - rounded)

so, if for example a given IP gets two hits at level 3 and one hit
at level 2 its spamscore will be increased to 57 and the message
will be rejected, same thing in case one hit from a list from level 1
will be met; but... let's say you get a level3 and a level2 hit; the
message score will be increased of 41 and the message may
get through due to "low spam score"

If you want a "one hit one block" you'll need to put the DNSBLs
which you want to use for blocking at level 1


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