Block unwanted users from registering to your WordPress site with custom defined blacklist and whitelist rules.
Remotely add known terms into the WordPress blacklist keys to manage spam
Limit Attempts Booster is a WordPress plugin which provides high security and limits your WordPress access. It also safes from Brute Force Attacks.
You need to ban a bad user from accessing your WordPress website or admin area by user's IP address, or country. Detailed Logs and Statistics.
Plugin tool for assembling lists of IP addresses, emails, and URLs from spam comments.
This plugin will make your blog more secure by adding rules which spambots will not pass.
Add-on plugin for gravity forms allowing you to specify email domains that will throw a validation error blocking them from submitting the form.
Bans IP addresses that have been caught and blacklisted by Spam Karma more than 5 times.
Block/blacklist known (and custom) spam referring domains at the WordPress level with an HTTP 403 Forbidden page.
Block comment spam in WordPress with this plugin. Verify comments automatically with the SpamLytics API, and prevent comment spam. No captcha.
Restricts registration to email addresses listed within the options file. Assumes WP native registration is turned off.
SiteBrains blocks spam posts using a completely configurable set of rules. Both interactively as the user types and on our servers upon submission.
WangGuard Blacklisted Words is an Add-on for WangGuard plugin. You can blacklist words.
Provides a simple means to integrate tools provided by Project Honeypot to capture spammers and link harvesters that visit your blog.
It will Prevent fake orders and Blacklist fraud customers of your store.
Geo-Captcha shows a captcha image only to countries you don't trust. Geo-Blacklists allows you to disable comments for some countries.
Provides the ability to retrieve information on a commentators IP address without leaving the "edit-comments.php" page.
A lightweight plugin to block any email domain from WooCommerce and Easy Digital Download checkout page
Check if a visitor is listed on httpBL.abuse.ch, see http://dnsbl.abuse.ch/faq.php#about_httpbl for more information.
The ability to mark specific users as spammers like on Multisite install.
Prevent people from registering with emails that contain a subdomain to help reduce spam.
Adds Whitelist and Blacklist options for Trackbacks and Pingbacks
Extension for the statify plugin to add a customizable blacklists.
A plugin to understand SpamDyke 's error codes
The increase in efficiency of management of a comment blacklist is attained, and a spam comment is blocked.
Ban visitors from certain sites from viewing or adding comments.
Tornevall Networks DNS Blacklist support for WordPress