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Article: 908
From: Anthony Howe
Date: 2006-05-01 12:00:00 -0400
Subject: Find the myth in link!

Removal...........: milters-request@milter.info?subject=remove
More information..: http://www.milter.info/#Support

I'm happy to announce milter-link, a mail content filter that extracts 
URLs, such as http: and mailto: links, from a message body and tests 
them against one or more URI blacklists such as SURBL, URIBL, and 
SpamHaus. It can handle plain text, HTML, and/or MIME encoded messages 
on-the-fly and supports testing of nested URLs in "redirector" links.

Another interesting option of this milter, that is sure to prove 
controversial I'm sure, is the ability to follow web links to verify if 
they really exist or check if they are circular references and follow 
redirections to the "origin" web server, which might be different from 
the source link. The origin server can then be tested against the URI 
blacklists. Essentially the assumption here is that unsubscribe / remove 
links are broken in some fashion so that the spammer appears to comply 
with opt-out requests, but does not. The other assumption is that a 
spammer may have one primary web site, but specifies many different URLs 
in many different messages in an effort to foil URI blacklists that list 
the source link found in a message, but not the ultimate destination. 
Regardless, its an option that can be enabled and tested if you find the 
idea interesting.


Anthony C Howe          Skype: SirWumpus                    SnertSoft
+33 6 11 89 73 78         AIM: SirWumpus    Sendmail Milter Solutions
http://www.snert.com/     ICQ: 7116561

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