Samir Shah

This plugin has two modes – basic and Akismet-enhanced.
Basic mode: the plugin will serve a CAPTCHA to all commenters that aren’t logged in and don’t have a previously approved comment. Repeat commenters will never see a CAPTCHA.
Akismet-enhanced mode (recommended): the plugin will serve a CAPTCHA only if Akismet identifies a comment as spam (much less frequently than the basic mode). Just install an activate <a href="https://wordpress.org/extend/plugins/akismet/" rel="ugc">Akismet</a> to enable this mode.
Note that a CAPTCHA will only appear after a comment is submitted. When a commenter is served a CAPTCHA:
<ul>
<li>If they fail, then the comment will be automatically discarded or trashed (and won’t clutter up your spam queue).</li>
<li>If they pass, it will be allowed into the spam queue (or approved, if you so choose). This means that any false positives from Akismet will be easily identified without you having to trawl through all the spam comments manually.</li>
</ul>
Most genuine commenters will be able to comment on your site hassle-free, without ever seeing a CAPTCHA.
The default CAPTCHA is a simple text-based test. There is also the option to use <a href="http://www.google.com/recaptcha" rel="nofollow ugc">reCAPTCHA</a> if you want something more robust (free API key required). You can also style the CAPTCHA page to fit with your own WordPress theme.
If you come across any bugs or have suggestions, please use the plugin support forum or <a href="http://rayofsolaris.net/contact/" rel="nofollow ugc">email me</a>. I can’t fix it if I don’t know it’s broken! Please check the <a href="https://wordpress.org/extend/plugins/wp-conditional-captcha/faq/" rel="ugc">FAQs</a> for common issues.
Thanks to the following people for contributing translations of this plugin: Belorussian – <a href="http://pc.de" rel="nofollow ugc">Marcis G</a>, Brazilian Portuguese – Stefano, Czech – <a href="http://trumplin.com/" rel="nofollow ugc">Ted</a>, Danish – Jesper, Dutch – <a href="http://wpwebshop.com/books/" rel="nofollow ugc">Rene</a>, Estonian – <a href="http://www.itransition.com" rel="nofollow ugc">Itransition</a>, Finnish – Jani, French – <a href="http://android-software.fr" rel="nofollow ugc">Laurent</a>, German – <a href="http://jochenpreusche.com" rel="nofollow ugc">Jochen</a>, Hindi – <a href="http://outshinesolutions.com" rel="nofollow ugc">Outshine Solutions</a>, Hungarian – <a href="http://www.televizio.sk" rel="nofollow ugc">Gyula</a>, Italian – <a href="http://gidibao.net" rel="nofollow ugc">Gianni</a>, Lithuanian – Mantas, Polish – <a href="http://www.spin.siedlce.pl" rel="nofollow ugc">Pawel</a>, Romanian – <a href="http://simplu.mixnet.ro" rel="nofollow ugc">Lotus</a>, Russian – <a href="http://www.everycloudtech.com/" rel="nofollow ugc">Ivanka</a>, Spanish – <a href="http://www.reinventia.net" rel="nofollow ugc">Reinventia</a>, Swedish – <a href="http://www.umu.se" rel="nofollow ugc">Hugo</a>, Turkish – Tony, Ukranian – <a href="http://www.everycloudtech.com/" rel="nofollow ugc">Ivanka</a>. Some of these translations are a bit out of date – updates welcome!

Conditional CAPTCHA

Asks commenters to complete a simple CAPTCHA if they don't have a previously approved comment, or if Akismet thinks their comment is spam.

webbernaut

Plugin is easy to use: just install it, use short code [email] and it just works. If you want multiple email addresses go to the settings page and create your custom email address and use the short code referenced. Will be similar to [email name=”cfe-example”]. Simple to add a subject line with subject parameter in shortcode [email name=”cfe-example” subject=”My Email Subject Line”]
Simple and easy to use plugin for displaying your email on the front end of your website safely and securely through JavaScript cloaking / obfuscation. Email that is displayed is the email you have setup as your admin email in WordPress General Settings or the custom email you setup in on the “Cloak Email” settings page. Source code does not show your actual email address which keeps scrapers from email harvesting and putting you on their email spam lists.
<h3>How it works</h3>
The Cloak Front End Email plugin follows the same methodology as <a href="https://developers.cloudflare.com/support/more-dashboard-apps/cloudflare-scrape-shield/what-is-email-address-obfuscation/" rel="nofollow ugc">Cloudflare’s email cloaking</a>. The email addresses are not in the source code of the website. Therefore any programing language that is doing a request to the site will scrape the source code of a website and since the email is not embedded in the source your emails will not be leaked. The plugin also protects against headless browsers PhantomJS, SlimerJS and Selenium that use default agent.
Source code will look like this (see screenshot below): 
<a href=”#”>loading…</a>
*Note: If users have javascript disabled on their browser they will get text saying “loading…” in place of the actual email.
** Color Customization ** 
Currently the email link will default to your global styles. We do not have a color setting yet but plan to in the future. Until then it’s pretty easy to stylize the color with some very basic CSS.
Each email has a custom html class assigned to it so you could add css styles to your style sheet for each specific one (you would have to inspect the code in the browser to see what class is added, it’s dynamic so will depend on the email). It follows the same pattern as the shortcode name paramater [email name=”cfe-bob”]
.cfe-jsemail-cfe-bob a {color:#000;}
You can drop this code into the custom css module inside WordPress.
Appearance > Customize > Additional CSS
Another example with the default dashboard email [email] 
<a href=”#”>loading…</a>
.cfe-jsemail-cfe-dashboard a {color:#000;}
Or you can set the global style using the below CSS.
.cfe-wrapper a {color:#000;}
Optional 
.cfe-wrapper a:hover {color:purple;}

Cloak Front End Email

Cloak / Obfuscate your email address with JavaScript in a simple short code [email].

Conditional CAPTCHA vs Cloak Front End Email