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Stop Signup Spam will prevent user registration of anyone trying to sign up with an the email address or IP address that has been reported to <a href="http://stopforumspam.com/" rel="nofollow ugc">Stop Forum Spam</a>.
Contrary to what the name implies, Stop Forum Spam can be used with any web service, not just forums.
At this time, Stop Signup Spam integrates with:
<ul>
<li>The core WordPress registration form</li>
<li>Restrict Content Pro</li>
<li>MemberPress</li>
<li>Give</li>
</ul>
By installing this plugin, you consent to an API call sent from your WordPress site to Stop Forum Spam after every attempted user registration. The API call includes the user’s email address and IP address.
It is a similar concept to <a href="https://wordpress.org/plugins/akismet/" rel="ugc">Akismet</a>, except instead of checking for blog comment spam, it checks for user signup spam.
Unlike Akismet, no API key is required to query Stop Forum Spam’s database. Partly because of this, I decided not to include a settings page in the Stop Signup Spam plugin. Just activate and you are all set.
The plugin does not log any user registration info. Any data sent to Stop Forum Spam would fall under their <a href="https://www.stopforumspam.com/privacy" rel="nofollow ugc">privacy policy</a>.
Please note that Stop Forum Spam is a third-party service that I have no affiliation with. I just found it, could not find any existing WordPress plugins that worked with it, and built one myself.
It has helped me cut down on signup spam on a free membership site that I run, and I hope it will help you do the same.

Stop Signup Spam

Check user registration info against the Stop Forum Spam database before allowing registration

Ben Marshall

Protect your WordPress website seamlessly with Zero Spam for WordPress! Eliminate spam and malicious attacks that can harm your online presence. Our plugin integrates effortlessly with <a href="https://www.zerospam.org" rel="nofollow ugc">Zero Spam</a>, <a href="https://www.stopforumspam.com/" rel="nofollow ugc">Stop Forum Spam</a>, and <a href="https://www.projecthoneypot.org/" rel="nofollow ugc">Project Honeypot</a> to offer a strong defense system.
Rest easy knowing that we utilize multiple detection methods to swiftly identify and halt potential threats. Whether it’s pesky spam, devious trolls, or cunning hackers, Zero Spam is here to protect your website.
<h4>Worry-free, Powerful Protection at Your Fingertips</h4>
<ul>
<li>No captchas or moderation queues — no longer a admin’s problem.</li>
<li>Our system dynamically blocks threats, keeping your site safe.</li>
<li>Integration with global IP reputation providers for enhanced security.</li>
<li>Block IPs temporarily or permanently, keep unwanted visitors out.</li>
<li>Geolocation tracks origins of threats, providing valuable insights.</li>
<li>Ability to block countries, regions, zip/postal codes & cities.</li>
<li>Utilize <a href="https://github.com/splorp/wordpress-comment-blacklist" rel="nofollow ugc">splorp’s Comment Blacklist</a> to strengthen your disallowed list.</li>
<li>Block disposable & malicious email effortlessly with <a href="https://github.com/disposable" rel="nofollow ugc">disposable</a>.</li>
<li>Multiple techniques, including the renowned solution by <a href="https://davidwalsh.name/wordpress-comment-spam" rel="nofollow ugc">David Walsh</a>.</li>
</ul>
<h4>Seamlessly integrates with popular plugins including:</h4>
<ul>
<li><a href="https://wordpress.org/plugins/woocommerce/" rel="ugc">WooCommerce</a> — Secure customer registrations.</li>
<li><a href="https://givewp.com/ref/1118/" rel="nofollow ugc">GiveWP</a> — Prevents attempts to test stolen credit cards.</li>
<li><a href="https://wordpress.org/plugins/wp-user-avatar/" rel="ugc">ProfilePress</a> — Keeps registrations safe & secure.</li>
<li><a href="https://wordpress.org/plugins/mailchimp-for-wp/" rel="ugc">Mailchimp for WordPress</a> — Protects sign-ups from abuse.</li>
<li><a href="https://www.gravityforms.com/" rel="nofollow ugc">Gravity Forms</a>, <a href="https://wordpress.org/plugins/contact-form-7/" rel="ugc">Contact Form 7</a>, <a href="https://wordpress.org/plugins/wpforms-lite/" rel="ugc">WPForms</a>, <a href="https://wordpress.org/plugins/formidable/" rel="ugc">Formidable Form Builder</a>, <a href="https://wordpress.org/plugins/fluentform/" rel="ugc">Fluent Forms</a>, <a href="https://wordpress.org/plugins/wpdiscuz/" rel="ugc">wpDiscuz</a> — Versatile form protection.</li>
</ul>
With Zero Spam for WordPress, you not only get exceptional protection but also a reliable support that ensures your peace of mind.
<h4>Enhance Detection with Optional 3rd-Party Integrations</h4>
Zero Spam for WordPress can integrate optional services for enhanced spam detection. Before using these, we recommend reviewing their terms and privacy policies.
<ul>
<li><a href="https://www.zerospam.org/" rel="nofollow ugc">Zero Spam</a> – Utilize our real-time IP reputation analysis. Take a look at our <a href="https://www.zerospam.org/privacy/" rel="nofollow ugc">Privacy Policy</a> and <a href="https://www.zerospam.org/terms/" rel="nofollow ugc">Terms of Use</a> for more details.</li>
<li><a href="https://ipbase.com/" rel="nofollow ugc">ipbase.com</a> – Access detailed geolocation information of attackers. Familiarize yourself with their <a href="https://ipbase.com/privacy-policy/" rel="nofollow ugc">Privacy Policy</a> & <a href="https://www.iubenda.com/terms-and-conditions/41661719" rel="nofollow ugc">Terms of Use</a>.</li>
<li><a href="https://ipinfo.io/" rel="nofollow ugc">ipinfo.io</a> – Gather geolocation details of malicious users. Refer to their <a href="https://ipinfo.io/privacy-policy" rel="nofollow ugc">Privacy Policy</a> & <a href="https://ipinfo.io/terms-of-service" rel="nofollow ugc">Terms of Use</a> for further information.</li>
<li><a href="https://ipstack.com/" rel="nofollow ugc">ipstack</a> – Obtain extensive geolocation insights. Review their <a href="https://www.ideracorp.com/Legal/APILayer/PrivacyStatement" rel="nofollow ugc">Privacy Policy</a> & <a href="https://ipstack.com/terms" rel="nofollow ugc">Terms of Use</a> to learn more.</li>
<li><a href="https://www.stopforumspam.com/" rel="nofollow ugc">Stop Forum Spam</a> – Verify if visitors’ IPs have been reported. Explore their <a href="https://www.stopforumspam.com/privacy" rel="nofollow ugc">Privacy Policy</a> and <a href="https://www.stopforumspam.com/legal" rel="nofollow ugc">Terms of Use</a> for additional details.</li>
<li><a href="https://www.projecthoneypot.org/" rel="nofollow ugc">Project Honeypot</a> – Check if visitors’ IPs have been flagged. Refer to their <a href="https://www.projecthoneypot.org/privacy_policy.php" rel="nofollow ugc">Privacy Policy</a> and <a href="https://www.projecthoneypot.org/terms_of_use.php" rel="nofollow ugc">Terms of Use</a> for more information.</li>
<li><a href="https://developers.google.com/maps" rel="nofollow ugc">Google Maps</a> – Plot attack locations on Google Maps. Please review their <a href="https://www.ideracorp.com/Legal/APILayer/PrivacyStatement" rel="nofollow ugc">Privacy Policy</a> & <a href="https://developers.google.com/terms/site-terms" rel="nofollow ugc">Terms of Use</a> for complete details.</li>
</ul>
Additionally, you have the option to contribute to Zero Spam’s improvement by enabling the sharing of detection information. For further information on the shared data, kindly refer to our <a href="https://github.com/Highfivery/zero-spam-for-wordpress/wiki/FAQ" rel="nofollow ugc">FAQ</a>.

Zero Spam for WordPress

Has been my go-to anti-spam plugin for quite some time. I've used many of the techniques individually on many sites. Having them rolled up into a single plugin is just amazing!

All 1-star reviews that say it doesn't work, don't have it setup/integrated properly, which can take a little bit of effort. There is no magical anti-spam protection that instantly happens when you activate it. BUT, once you do implement a few of the techniques this plugin provides, spam becomes a thing of the past.  

Prior to v5.2.15, would have been an easy 5-star rating. Because of v5.2.15, I regrettably have to give it 1-star review. Plugin author: This is an ANTI-SPAM plugin, NOT a Ukraine support plugin. If you want to show your support for Ukraine, make a plugin for it. DON'T ruin a useful plugin by injecting unrelated political beliefs it into it. Blocking spam is blocking spam. Supporting Ukraine is supporting Ukraine. Mix them together and you just end up ruining both.

v5.2.15
    feat(ukraine): we’ll no longer provide protection for .ru, .su, and .by domains & will display a banner of support for the ukrainian people on those sites – united with ukraine

Personal Note to the Plugin Author:
It's your plugin, you can do what you want, but here's an important question: Is this plugin for YOU (the plugin author) to broadcast political beliefs, or for US (the plugin users) to block spam? Between those two, which one is more important? Pick one and go with it. If you pick personal political beliefs over plugin user functionality then it's only a matter of time until someone takes all of your hard work on this plugin, removes your political beliefs, releases it as a new plugin, and surpasses you in # of installs, making this plugin obsolete. You will be your own undoing. Would hate to see that happen to an otherwise WONDERFUL & AMAZING plugin!

Remove personal politics from this plugin, and my review will change to the 5-star review that it deserves.

Politics Ruin Yet Another Good Thing

No spam, no scams, just seamless experiences with Zero Spam for WordPress - the shield your site deserves.

Stop Signup Spam vs Zero Spam for WordPress