[SATLUG] Attn: Bob Tracy

[Bob Tracy]

On Wed, 10 Jan 2007 11:47:18 -0600, David Kowis wrote
> I'm going to take this opportunity to point out that a statistical
> filter won't have this problem.

Acknowledged, but the problem that *all* statistical filters have is
they must receive the message before they can analyze it.  My position
to date has been that once the DATA command in an SMTP transaction has
been issued, the battle with a spammer is lost.  Folks who have plenty
of horsepower to throw at the problem don't mind (for the most part)
the loss of available computing power due to message content analysis.
Envelope filtering, while admittedly imperfect, allows me to use an
AMD K6-III/450 system without having to suffer the compute burden of
analyzing 2,000+ messages/day (and that's for a single user).

The single most effective spam filter I've seen in terms of maximal
results for minimal effort is enabling Postfix's "reject_unknown_client"
feature.  On a typical day, this one filter alone accounts for half the
total of spam I don't see.

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Bob Tracy                   WTO + WIPO = DMCA? http://www.anti-dmca.org
rct at frus.com
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