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Mail::SpamAssassin::PlUser:Contributed PerMail::SpamAssassin::Plugin::ASN(3pm)

       Mail::SpamAssassin::Plugin::ASN - SpamAssassin plugin to look up the
       Autonomous System Number (ASN) of the connecting IP address.

        loadplugin Mail::SpamAssassin::Plugin::ASN

        asn_lookup asn.routeviews.org _ASN_ _ASNCIDR_

        add_header all ASN _ASN_ _ASNCIDR_

       This plugin uses DNS lookups to the services of
       "http://www.routeviews.org/" to do the actual work. Please make sure
       that your use of the plugin does not overload their infrastructure -
       this generally means that you should not use this plugin in a high-
       volume environment or that you should use a local mirror of the zone
       (see "ftp://ftp.routeviews.org/dnszones/").

       This plugin allows you to create template tags containing the
       connecting IP's AS number and route info for that AS number.

       The default config will add a header that looks like this:

        X-Spam-ASN: AS24940

       where "AS24940" is the ASN and "" is the route
       announced by that ASN where the connecting IP address came from. If the
       AS announces multiple networks (more/less specific), they will all be
       added to the "_ASNCIDR_" tag, separated by spaces, eg:

        X-Spam-ASN: AS1680

       The standard ruleset contains a configuration that will add a header
       containing ASN data to scanned messages.  The bayes tokenizer will use
       the added header for bayes calculations, and thus affect which BAYES_*
       rule will trigger for a particular message.

       Note that in most cases you should not score on the ASN data directly.
       Bayes learning will probably trigger on the _ASNCIDR_ tag, but probably
       not very well on the _ASN_ tag alone.

       http://www.routeviews.org/ - all data regarding routing, ASNs etc

       http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4770 -
       SpamAssassin Issue #4770 concerning this plugin

       Experimental - Dec. 18, 2006

       No in-depth analysis of the usefulness of bayes tokenization of ASN
       data has been performed.

       asn_lookup asn-zone.example.com [ _ASNTAG_ _ASNCIDRTAG_ ]
           Use this to lookup the ASN info for first external IP address in
           the specified zone and add the AS number to the first specified tag
           and routing info to the second specified tag.

           If no tags are specified the AS number will be added to the _ASN_
           tag and the routing info will be added to the _ASNCIDR_ tag.  You
           must specify either none or both of the tags.  Tags must start and
           end with an underscore.

           If two or more asn_lookups use the same set of template tags, the
           results of their lookups will be appended to each other in the
           template tag values in no particular order.  Duplicate results will
           be omitted when combining results.  In a similar fashion, you can
           also use the same template tag for both the AS number tag and the
           routing info tag.


             asn_lookup asn.routeviews.org

             asn_lookup asn.routeviews.org _ASN_ _ASNCIDR_
             asn_lookup myview.example.com _MYASN_ _MYASNCIDR_

             asn_lookup asn.routeviews.org _COMBINEDASN_ _COMBINEDASNCIDR_
             asn_lookup myview.example.com _COMBINEDASN_ _COMBINEDASNCIDR_

             asn_lookup in1tag.example.net _ASNDATA_ _ASNDATA_

perl v5.10.0                      2008-06-Mail::SpamAssassin::Plugin::ASN(3pm)