Andrew Norcross

Grant Hutchinson

Comment Blacklist Manager retrieves a list of terms from a remote source and updates the <code>disallowed_keys</code> setting in WordPress. The plugin will automatically fetch a list of terms on a regular schedule and update the contents of the “Disallowed Comment Keys” field. Terms added manually via the “Local Blacklist” field will be retained during the scheduled updates. Terms added manually to the “Excluded Terms” field will be removed from the list.
The default list of terms is fetched from a <a href="https://github.com/splorp/wordpress-comment-blacklist/" title="Comment Blacklist for WordPress" rel="nofollow ugc">GitHub</a> repository maintained by <a href="https://splorp.com/" title="Interface considerations. Gadget accumulation. Typography. Scotch." rel="nofollow ugc">Grant Hutchinson</a>.

Comment Blacklist Manager

Does as advertised. I especially liked how you can exclude words from the automated blacklist if they don't suit your website.



Great Little Plugin

Remotely add terms to the WordPress Disallowed Comment Keys field to manage spam.

tornevall

Tornevall Networks DNS Blacklist support. Blocks comment functions or redirects visitors who is blacklisted to external site. 
Tested with WPCF7 5.1.4 (v2.0.8).
<a href="https://tracker.tornevall.net/projects/DNSBLWP/issues" rel="nofollow ugc">Project tracker</a> – Contribute with suggestions or bug reports here! 
<a href="https://wordpress.org/plugins/tornevall-networks-dnsbl-implementation/" rel="ugc">Plugin URL</a>
<h4>Contribute</h4>
Can you help? Register and join the <a href="https://tracker.tornevall.net/projects/DNSBLWP/issues" rel="nofollow ugc">project tracker</a> and start creating! 
You can also join the open source project at <a href="https://bitbucket.tornevall.net/projects/WWW/repos/tornevall-wp-dnsbl/browse" rel="nofollow ugc">Bitbucket</a>.
Want to add a new language to this plugin? You can contribute via <a href="https://translate.wordpress.org/projects/wp-plugins/tornevall-networks-dnsbl-implementation" rel="nofollow ugc">translate.wordpress.org</a>.

Tornevall Networks AntiSpam and Fraud Blacklist (DNSBL w/FraudBL) implementation

Tornevall Networks DNS Blacklist support for Wordpress

Comment Blacklist Manager vs Tornevall Networks AntiSpam and Fraud Blacklist (DNSBL w/FraudBL) implementation