Date: Mon, 16 Feb 2004 20:48:01 +1030 From: "Paul A. Hoadley" <paulh@logicsquad.net> To: freebsd-questions@freebsd.org Subject: Re: spam removal Message-ID: <20040216101801.GB58487@grover.logicsquad.net> In-Reply-To: <20040216043701.C95778@admin1.mdc.net> References: <20040216091316.98506.qmail@web9602.mail.yahoo.com> <20040216093332.GA85516@xor.obsecurity.org> <20040216043701.C95778@admin1.mdc.net>
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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@logicsquad.net mailto:phoadley@maths.adelaide.edu.au
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