On Wed, 19 Mar 2003, Chris Lewis wrote:
Blacklist effectiveness on real email:
BOPM 100635 5.34
CONTENT 54802 2.91 (non-IP based filters, not used
on spamtrap)
Flonetwork 6096 0.32
IP, NOT BL 34946 1.85
MONKEYPROXY 135285 7.17
NTblack 38608 2.05
NTmanual 30370 1.61
OBproxies 46420 2.46
OBrelays 17419 0.92
OK 5330 0.28
OSinputs 31922 1.69
OSproxy 2121 0.11
OSsocks 54144 2.87
SBL 51825 2.75
TOTAL 1885655 100.00
TOTAL BLOCK 316567 16.79 (total blocked)
How come you're such a large entity yet this figure is so much lower than
everyone else is seeing? Is it because the companies (like ours) that work
in spam filtering are sought out by those with a spam problem, whereas
your user base covers everyone?
2) Lesser used blacklists have higher FP rates, because fewer legit
senders hit them. OBrelays is only used by two sites: us, and its
maintainer. Despite being _large_ (OB is > 30 million mail addresses),
it's still small compared to the coverage of the other lists, hence the
relatively higher FP percentage.
Why don't they make it publicly available then?
Matt.
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