WP-DenyHost denies a spammer from accessing your WordPress site. WP-DenyHost can add spammers to the CloudFlare Block list
Based on a users IP address, WP-DenyHost will block a spammer if he already has been tagged as a spammer. Use it together with the Akismet plugin. Akismet tags the spammer, and WP-DenyHost prevents him from accessing you site.