webvitaly

<ul>
<li><a href="http://web-profile.net/wordpress/plugins/fortify/" title="Plugin page" rel="nofollow ugc">Fortify</a></li>
<li><a href="http://web-profile.net/donate/" title="Support the development" rel="nofollow ugc">Donate</a></li>
<li><a href="https://github.com/webvitalii/fortify" title="Fork" rel="nofollow ugc">GitHub</a></li>
</ul>
Fortify plugin blocks automatic spam in comments section. No captcha.
Plugin is easy to use: just install it and it just works.
Blocked comments can be stored in the Spam area if needed. This can be enabled/disabled via Settings page. This is useful for testing and debug purpose. Blocked spam comments can be easily converted to regular comments if needed.
Fortify plugin is GDPR compliant and does not store any other user data except of the behavior mentioned above.
Plugin blocks spam only in comments section.
After installing the Fortify plugin try to submit a comment on your site being logged out. 
If you get an error – you may check the solution in the <a href="https://wordpress.org/support/plugin/fortify" rel="ugc">Support section</a> or submit a new topic with detailed description of your problem.

Fortify

Jennifer M. Dodd

BuddyPress uses the user_status field to classify users as spammers. Users who 
are marked as spammers should not receive further email notifications from the 
system.
This plugin filters the To, Cc, and Bcc fields that are passed to wp_mail().
This plugin is a beta release, and as such, is not suitable for deployment on 
a production server.
<h3>Credits</h3>
Development funded, in part, by Ariel Meadow Stallings and the Offbeat Empire.

Spammer Silent Treatment

Remove known spammer email addresses from wp_mail()'s To, Cc, and Bcc fields.

Fortify vs Spammer Silent Treatment