SURBL has created a three-level-tlds list that contains domains that should now be checked at the fourth level. It joins the existing list of two-level-tlds domains that should be checked at the third level. We also added some frequently abused web hosts into both of these TLD files, so they are no longer strictly CCTLD files, but should be able to function the same way for applications. We also moved the location of the files. For more information please see our Implementation Guidelines:

http://www.surbl.org/implementation.html

The new location of these files is:

http://www.surbl.org/tld/two-level-tlds

and:

http://www.surbl.org/tld/three-level-tlds

Please do not retrieve these files more often than once per day. They update only rarely. The old location will redirect to the new one for a while then go away eventually. Please update all SURBL applications accordingly.

The TLD handling change is backward compatible, but there will be more detections if implemented.

The updated TLD data in part come from:

http://rulesemporium.com/rules/90_3tld.cf http://rss.uribl.com/hosters/hosters.txt http://publicsuffix.org/ https://wiki.mozilla.org/Gecko:Effective_TLD_Service http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/src/effective_tld_... http://svn.apache.org/repos/asf/spamassassin/branches/3.3/lib/Mail/SpamAssas...

and ongoing but infrequent registry research.