arijose

This plugin was created to stop human spammers. Captcha or other image methods do not work when an actual person is spamming your site. This plugin helps to resolve this issue. It allows your to create a custom question and answer on the registration page of a wordpress site that only the users in your demographic can answer. An example (and the reason I created this plugin) is a school track website. I would get up to 3 to 5 bogus registrations a day. I added this plugin with the question “What city is your school in?” and that number went to 0. Someone in another area is not going to know this question, however anyone who would/should be registering would defintely know the answer. This plugin will not work for everyone but it certainly was a perfect fit for me and I know it will help others too.

ARS Reg Secure

This plugin helps block bogus registrations by allowing a custom registration field and answer.

identibyte

Identibyte for Contact Forms 7 will detect and block signups and 
submissions from disposable email addresses in your forms. Saving 
resources for real users allows you to spend time and money on the 
users that need it most.
Setting up is easy:
<ol>
<li>Install the Identibyte for Contact Form 7 plugin.</li>
<li>Enable Identibyte validation on any Contact Form 7 email tag.</li>
</ol>
You can use Identibyte for Contact Form 7 completely free without an 
Identibyte account and make 20 “checks” per hour. If you need more 
checks, you just need to sign up for Identibyte and create a free or 
upgraded API token. Learn more below.
<h4>How it works</h4>
When you have Identibyte for Contact Form 7 installed and activated, 
Identibyte will validate the <code>[email]</code> tags in your Contact Form 7 
forms. All you need to do is add the <code>identibyte:true</code> option to any 
 [email] or <code>[email*]</code> tag.
For example, like this: <code>[email* your-email identibyte:true]</code>
When the form is submitted, Identibyte will check if the email is a 
disposable email address. Identibyte has custom technology and 
processes for discovering and keeping a highly up-to-date blacklist of 
disposable email providers.
And that’s it! Now your signup forms are intelligent and can detect 
and block users signing up or submitting information that have a 
disposable email address.
<a href="https://identibyte.com" rel="nofollow ugc">Learn more about how Identibyte works here</a>.
<h4>Adding an API token</h4>
If you need to make more than 20 API requests an hour, you can 
[sign up for an Identibyte account]((https://identibyte.com/signup) 
and <a href="https://identibyte.com/dashboard/tokens" rel="nofollow ugc">create an API token</a>. 
Once you have a token, enter it the Identibyte plugin’s admin settings 
page.
After the 20 checks per hour are exhausted, if you haven’t entered an 
API token, Identibyte will be bypassed and will not fail the form 
submission validation.
<h4>What you need to know</h4>
Identibyte for Contact Form 7 relies on making HTTP requests to the 
<a href="https://identibyte.com" rel="nofollow ugc">Identibyte API</a>. API calls are made when a 
Contact Form 7 form is submitted, for every field that has the 
 identibyte:true option.
Identibyte is an external service and has it’s own 
<a href="https://identibyte.com/termsofservice" rel="nofollow ugc">Terms of Service</a> and 
<a href="https://identibyte.com/privacypolicy" rel="nofollow ugc">Privacy Policy</a>, which you can 
review at those links.
<h4>Support</h4>
For any assistance, check out the 
<a href="https://identibyte.com" rel="nofollow ugc">Identibyte website</a> and 
<a href="https://identibyte.com/#docs" rel="nofollow ugc">API documentation</a> for helpful 
resources, or email us 
directly at admin@identibyte.com.

Identibyte for Contact Form 7

Make your forms intelligent. Detect and block signups and emails from disposable and fake email addresses in your Contact Form 7 forms.

ARS Reg Secure vs Identibyte for Contact Form 7