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Mail::SpamAssassin::PlUser:Contributed Perl Mail::SpamAssassin::Plugin::ASN(3)
NAME
       Mail::SpamAssassin::Plugin::ASN - SpamAssassin plugin to look up the
       Autonomous System Number (ASN) of the connecting IP address.
SYNOPSIS
        loadplugin Mail::SpamAssassin::Plugin::ASN
        asn_lookup asn.routeviews.org _ASN_ _ASNCIDR_
        asn_lookup_ipv6 origin6.asn.cymru.com _ASN_ _ASNCIDR_
        add_header all ASN _ASN_ _ASNCIDR_
        header TEST_AS1234 X-ASN =~ /^1234$/
DESCRIPTION
       This plugin uses DNS lookups to the services of an external DNS zone
       such as at "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/").  Other
       similar zones may also be used.
TEMPLATE TAGS
       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 field that looks like this:
        X-Spam-ASN: AS24940 213.239.192.0/18
       where "24940" is the ASN and "213.239.192.0/18" 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 89.138.0.0/15 89.139.0.0/16
       Note that the literal "AS" before the ASN in the _ASN_ tag is
       configurable through the asn_prefix directive and may be set to an
       empty string.
CONFIGURATION
       The standard ruleset contains a configuration that will add a header
       field containing ASN data to scanned messages.  The bayes tokenizer
       will use the added header field 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.
SEE ALSO
       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
STATUS
       No in-depth analysis of the usefulness of bayes tokenization of ASN
       data has been performed.
ADMINISTRATOR SETTINGS
       asn_lookup asn-zone.example.com [ _ASNTAG_ _ASNCIDRTAG_ ]
           Use this to lookup the ASN info in the specified zone for the first
           external IPv4 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 tag names.  Tag names 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.
           Examples:
             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_
       asn_lookup_ipv6 asn-zone6.example.com [_ASN_ _ASNCIDR_]
           Use specified zone for lookups of IPv6 addresses.  If zone supports
           both IPv4 and IPv6 queries, use both asn_lookup and asn_lookup_ipv6
           for the same zone.
       clear_asn_lookups
           Removes any previously declared asn_lookup entries from a list of
           queries.
       asn_prefix 'prefix_string'       (default: 'AS')
           The string specified in the argument is prepended to each ASN when
           storing it as a tag. This prefix is rather redundant, but its
           default value 'AS' is kept for backward compatibility with versions
           of SpamAssassin earlier than 3.4.0. A sensible setting is an empty
           string. The argument may be (but need not be) enclosed in single or
           double quotes for clarity.
perl v5.26.3                      2021-04-09Mail::SpamAssassin::Plugin::ASN(3)