On 2007-01-27 19:43:23 -0600, gep2(_at_)terabites(_dot_)com wrote:
To begin with, crude IP blocks will ALWAYS lose legitimate
mail, because a single IP address can send both legitimate
and zombie-generated mail.
We've been using the spamhaus dnsbls for several years and I can't
remember a single false positive. IP adresses which send legitimate
mails are simply not listed there (or if they are, there are so few of
them that it's indetectable).
It is true that they aren't sufficient, but they reduce spam by quite a
bit (they're by far the most frequent reason for a permanent error) with
practically zero false positives.
I don't know why you insist that they would have to list a single IP
address which sends both legitimate and zombie-generated mail. Just look
at spamhaus and you can see that this is false.
--
_ | Peter J. Holzer | I know I'd be respectful of a pirate
|_|_) | Sysadmin WSR | with an emu on his shoulder.
| | | hjp(_at_)hjp(_dot_)at |
__/ | http://www.hjp.at/ | -- Sam in "Freefall"
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