107 lines
5.1 KiB
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107 lines
5.1 KiB
Plaintext
From spamassassin-talk-admin@lists.sourceforge.net Mon Aug 26 16:47:05 2002
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6DD56A4D20; Mon, 26 Aug 2002 08:33:15 -0700 (PDT)
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Subject: Re: Whitelisting (Re: [SAtalk] SA In The News)
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Content-Type: text/plain; charset=US-ASCII; format=flowed
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MIME-Version: 1.0 (Apple Message framework v482)
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Cc: SpamAssassin Talk ML <spamassassin-talk@example.sourceforge.net>
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To: Bart Schaefer <schaefer@zanshin.com>
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From: "Craig R.Hughes" <craig@deersoft.com>
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In-Reply-To: <Pine.LNX.4.44.0208241234470.17127-100000@aztec.zanshin.com>
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X-Original-Date: Mon, 26 Aug 2002 08:33:19 -0700
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Date: Mon, 26 Aug 2002 08:33:19 -0700
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tests=EMAIL_ATTRIBUTION,FORGED_RCVD_TRAIL,FOR_FREE,IN_REP_TO,
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KNOWN_MAILING_LIST,QUOTED_EMAIL_TEXT,SPAM_PHRASE_03_05,
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SUBJECT_IS_NEWS,USER_AGENT_APPLEMAIL
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version=2.40-cvs
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X-Spam-Level:
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There is a whitelist RBL now! Ironport's Bonded Sender is
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basically a whitelist RBL where you post a bond to get on the
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list, and then lose the bond if you end up spamming from that IP
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address (or something like that). http://www.bondedsender.org/
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C
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On Sunday, August 25, 2002, at 07:58 PM, Bart Schaefer wrote:
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>> 4. DNSBL: Only certifies an ip address, not who is using it. As it is
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>> currently used, DNSBL allows you to look up if some IP address
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>> has been
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>> blacklisted by someone. What I haven't seen is a service that
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>> provides a
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>> DNS based whitelist.
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>
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> There's a practical reason for that: Any DNS list (white or
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> black) works
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> only for a limited number of IPs; the set of unlisted IPs is
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> much larger
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> than the set in the DNS list. If you have to make a binary decision to
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> accept or reject, you'll be wrong less often if you reject the
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> blacklist
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> and accept everything else, rather than accept the whitelist and reject
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> everything else.
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>
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> A whitelist is only helpful when (a) you only want mail from a limited
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> number of known sources, or (b) you can use a secondary system
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> like SA to
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> decide what to do with the vast unlisted masses. Most MTAs still make
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> only the binary decision, because the secondary computation is
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> expensive.
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>
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> With SA's cooperation, though, it might be worth a try. Even better if
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> one could get commercial anti-spam outfits to agree to factor it in.
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-------------------------------------------------------
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