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From Daniel Quinlan <>
Subject Re: Announcing SpamCopURI 0.08 support of SURBL for spam URI domain tests
Date Sat, 03 Apr 2004 08:34:24 GMT
Jeff Chan <> writes:

> Can you cite some examples of FP-prevention strategies?

1. Automated testing.  We're testing URLs (web sites).  That allows a
   large number of strategies which could be used from each aspect of
   the URL.

     A record
       check other blacklists
       check IP owner against SBL 
     domain name
       check name servers in other blacklists
       check registrar
       check age of domain (SenderBase information)
       check ISP / IP block owner (SenderBase, SBL, etc.)
     web content
       check web site for common spam web site content (porn, drugs, credit
	 card forms, empty top-level page, etc.)

   Any of those can also be used in concert with threshold tuning.  For
   example, lower thresholds if a good blacklist hits and somewhat
   higher thresholds for older domains.

2. Building up a long and accurate whitelist of good URLs over time
   would also help.  Maybe work with places that vouch for domain's
   anti-spam policies (Habeas, BondedSender, IADB) to develop longer

3. Using a corpus to tune results and thresholds (also whitelist


Daniel Quinlan                     anti-spam (SpamAssassin), Linux,    and open source consulting

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