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Mail::SpamAssassin::Plugin::ASNUser Contributed Perl DocumentatMail::SpamAssassin::Plugin::ASN(3)

       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

       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

       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

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

       asn_lookup asn-zone.example.com [ _ASNTAG_ _ASNCIDRTAG_ ]
	   Use this to lookup the ASN info in the specified zone for the first external IP
	   address 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 v5.16.3				    2011-06-06	       Mail::SpamAssassin::Plugin::ASN(3)
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