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Date:      Mon, 10 Dec 2001 00:58:43 +0100 (CET)
From:      Leif Neland <leifn@neland.dk>
To:        Javier Henderson <javier@KJSL.COM>
Cc:        <freebsd-isp@FreeBSD.ORG>
Subject:   Re: RBL's and tagging email with sendmail
Message-ID:  <20011210005404.K52959-100000@arnold.neland.dk>
In-Reply-To: <15375.40652.719713.111631@grumman.kjsl.com>

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On Thu, 6 Dec 2001, Javier Henderson wrote:

> Hi,
>
> I've had mixed luck with using the various RBL's out there. The rate
> of false positives can be high sometimes, resulting in too many
> legitimate messages being bounced.
>

What do you mean by false positives?

A: Blocking on servers which aren't open relays anymore? educate the
admins to report to the dnsbl when they have fixed their open relays.

B: Blocking on mail which is not spam, but from servers which are open
relays? Educate the admins, because they WILL be abused someday, even if
they haven't yet. Or if this doesn't help, the users will eventually move
to a responsible ISP, making inresponsible ISP's to go out of business.

Leif


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