doltics

Doltics Radar checks enabled WordPress flows before they complete. Admins can enable protection for outbound email, submitted comments, and account registrations under Settings > Doltics Radar.
Email protection uses WordPress core mail hooks when available. Doltics Radar also includes a Mailgun compatibility adapter for Mailgun versions that replace <code>wp_mail()</code> without calling <code>pre_wp_mail</code>.
<h3>API Contract</h3>
The plugin sends a JSON <code>POST</code> request to the URL <code>https://radar.doltics.com/score</code> :
<pre><code>{
 "text": "The sample text",
 "locale": "en"
}
</code></pre>
The API should return JSON using one of these response shapes:
<pre><code>{
 "score": 0.95,
 "classification": "spam",
 "signals": {
 "token_count": 10,
 "unknown_word_ratio": 0.1,
 "spam_keyword_score": 0.61,
 "uppercase_ratio": 0.34,
 "exclamation_density": 0.3,
 "url_count": 1
 }
}
</code></pre>
Numeric scores are compared against the configured threshold.

Doltics Radar

Protects selected WordPress email, comment, and registration flows with a spam protection API.

jamiechong

A lot of registration spam comes from emails with a subdomain. Spammers control a domain such as buymyjunk.com and then attempt to register on your site with emails such as irenemwd@foster2.buymyjunk.com and jakemgm@foster7.buymyjunk.com. This plugin simply blocks all registrations using a subdomain.
Reputable users will have a normal email address from a reasonable domain like @gmail.com, @mylegitbusiness.com, @outlook.com, @myschool.edu, etc.
There is no configuration and no setup. It simply just works. The plugin logs all blocked registrations so you can find potential false-positives. Find a link to this log file on the Plugins page where you activate/deactivate this plugin.

Ban Subdomain Emails

Prevent people from registering with emails that contain a subdomain to help reduce spam.

Doltics Radar vs Ban Subdomain Emails