----- Original Message ----- 
From: "Andy Schmidt" <[EMAIL PROTECTED]>

> This is of course prudent advice in general.
> Let me share my experiences (I'm not at all
> suggesting that this applies to anyone else's
> scenario).

> However, after a few years of tinkering, I
> did realize that (at least based on messages
> received by my mix of business clients) *I*
> was able to use some tests to outright delete
> 13% of all incoming mail (an additional 50%
> gets deleted by weight):

BLITZEDALL DELETE
NJABLPROXIES DELETE
AHBLPROXIES DELETE
SORBS-HTTP DELETE
SORBS-SOCKS DELETE
SORBS-MISC DELETE

MAILFROM DELETE
PERCENT DELETE

Other than the PERCENT test, I can produce false-positives from each of the
RBL tests listed above for everyday of the week.  I guess it depends on your
customer base and mail volume, but anyone running spam tests in an ISP
environment would be foolish and running great risk of deleting legitimate
messages by basing delete decisions on the results of any single RBL test
criteria.  And I feel that if you have a weight system available to you, why
take that risk at all?

Bill

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