NAME

       URILocalBL - blocklist URIs using local information (ISP names, address lists, and country
       codes)

SYNOPSIS

       This plugin creates some new rule test types, such as "uri_block_cc", "uri_block_cidr",
       and "uri_block_isp".  These rules apply to the URIs found in the HTML portion of a
       message, i.e. <a href=...> markup.

         loadplugin    Mail::SpamAssassin::Plugin::URILocalBL

       Why local blocklisting? There are a few excellent, effective, and well-maintained DNSBL's
       out there. But they have several drawbacks:

       • blocklists can cover tens of thousands of entries, and you can't select which ones you
         use;

       • verifying that it's correctly configured can be non-trivial;

       • new blocklisting entries may take a while to be detected and entered, so it's not
         instantaneous.

       Sometimes all you want is a quick, easy, and very surgical blocklisting of a particular
       site or a particular ISP. This plugin is defined for that exact usage case.

RULE DEFINITIONS AND PRIVILEGED SETTINGS

       The format for defining a rule is as follows:

         uri_block_cc SYMBOLIC_TEST_NAME cc1 cc2 cc3 cc4 ..
         uri_block_cc SYMBOLIC_TEST_NAME !cc1 !cc2 ..

       or:

         uri_block_cont SYMBOLIC_TEST_NAME co1 co2 co3 co4 ..
         uri_block_cont SYMBOLIC_TEST_NAME !co1 !co2 ..

       or:

         uri_block_cidr SYMBOLIC_TEST_NAME a.a.a.a b.b.b.b/cc

       or:

         uri_block_isp SYMBOLIC_TEST_NAME "Data Rancid" McCarrier Phishers-r-Us

       Example rule for matching a URI in China:

         uri_block_cc TEST1 cn

       If you specify list of negations, such rule will match ANY country except the listed ones
       (Finland, Sweden):

         uri_block_cc TEST1 !fi !se

       Continents uri_block_cont works exactly the same as uri_block_cc.

       This would block the URL http://www.baidu.com/index.htm.  Similarly, to match a Spam-haven
       netblock:

         uri_block_cidr TEST2 65.181.64.0/18

       would match a netblock where several phishing sites were recently hosted.

       And to block all CIDR blocks registered to an ISP, one might use:

         uri_block_isp TEST3 "Data Rancid" ColoCrossing

       Quote ISP names containing spaces.

       Lastly, if there's a country that you want to block but there's an explicit host you wish
       to exempt from that blocklist, you can use:

         uri_block_exclude TEST1 www.baidu.com

       if you wish to exempt URL's referring to this host. The same syntax is applicable to CIDR
       and ISP blocks as well.

DEPENDENCIES

       The Country-Code based filtering can use any Mail::SpamAssassin::GeoDB supported module
       like MaxMind::DB::Reader (GeoIP2) or Geo::IP.  ISP based filtering might require a paid
       subscription database like GeoIPISP.