spam removal
Paul A. Hoadley
paulh at logicsquad.net
Mon Feb 16 02:18:04 PST 2004
On Mon, Feb 16, 2004 at 04:44:25AM -0500, matthew wrote:
> > I recommend bogofilter for per-user filtering. Spamassassin is
> > also highly recommended for site use. I tend to dislike DNS-based
> > filtering because it has a high rate of false positives, and it
> > causes your users to lose legitimate mail if it's rejected at the
> > mail server.
>
> As far as I understand it, one does "not lose email" using dns-based
> blacklists.
Sure you can. If Alice wants to legitimately contact Bob from a
blacklisted IP (whether the blacklisting is actually Alice's fault, or
she's just fallen under an excessively large blanket), and Bob is
running DNS-based filtering, Bob's MTA blocks Alice based on her IP.
Bob loses legitimate mail. Admittedly you provided a counterexample,
but it is not always so easy.
--
Paul.
mailto:paulh at logicsquad.net
mailto:phoadley at maths.adelaide.edu.au
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