pixeline

This plugin provides an unobtrusive yet efficient protection against email harvesters / spambots. Here is a <a href="https://pixeline.be/blog/email-protector-demo-4258.html" rel="nofollow ugc">demo</a>.
Post/page authors may write email addresses in their article in the usual format (“john@doe.com”) without exposing them to spam email harvesters. The plugin takes care of the obfuscation, implementing a graceful degradation technique focusing on usability so as to protect your email addresses from harvesters while keeping them usable to your human visitors.
The plugin replaces any email address found in posts, pages, comments and excerpts, and replace them by a bit of html markup that should deceive most email harvesters: <code>john(replace the parenthesis by @)doe.com</code>. 
If javascript is available, it will display a clickable link and display the original email to the human user. Maximum usability, maximum protection.
Please <a href="https://wordpress.org/extend/plugins/pixelines-email-protector/" rel="ugc">rate the plugin</a> if you like it.
<h3>Usage</h3>
Write your email addresses inside your posts and pages as usual. When the plugin is activated, it will replace them by a human-readable html string that explains how to deduce the email address, and if javascript is available (99.9% of the time), the original email address will be displayed as a clickable mailto: link. For example: 
 Hello john@doe.com. How are you today? 
will become 
 John( replace these parenthesis by @ )doe.com.
Additionally, you can specify what the mailto: link should look like by sticking a parenthesis inside of which you put the visible link text, like this:
<pre><code>Hello john@doe.com(John Doe). How are you today?
</code></pre>
will become 
 John( replace these parenthesis by @ )doe.com.
<h4>inside a theme</h4>
If you need to protect emails inside your Theme’s files (like the footer.php for example), you can use the function safe_email() like this:
<pre><code> echo safe_email('you@domain.com'); <h3>Contribute</h3>
</code></pre>
Github repo: https://github.com/pixeline/pixeline-email-protector

Pixeline's Email Protector

Write email addresses without worrying about spambots and email harvesters.

cgarvey

This plugin lets you use a shortcode to automatically generate ‘cloaked’ email addresses in your content.
What is cloaking? 
Take an email address like barack@whitehouse.gov. If that was to appear on one of your posts/pages, it could easily be ‘scraped’ or ‘harvested’ automatically to add that email address to a spam list of some sort. Cloaking is all about making that harder to do.
How does this plugin do its cloaking? 
For any email address you include in your content, using the custom shortcode of [email barack@whitehouse.gov], that email address will appear as “barack -at- whitehouse -dot- gov” in your content initially. JavaScript running in the browser will then convert that email address to a regular, clickable, email link. Whilst it may seem pointless to convert a regular email address to a strange format only to convert it back again, the idea is that most automated ‘scrapers’, or ‘harvesters’, do not run JavaScript and hence won’t be able to pick up on the non-standard email address. The vast majority of users visiting your site will have JavaScript, and will see regular email addresses (not the strange format).
What about users who have no JavaScript, or have it disabled? 
They will see the strange format (“barack -at- whitehouse -dot- gov”). You can include a footnote using a custom short code [emailnojs] which will explain the strange format, if you wish to cater for that tiny minority of visitors.
<h3>License</h3>
This plugin uses the GPLv3 license.

Email JavaScript Cloak

A simple plugin to use JavaScript to cloak email addresses in your WordPress content (posts & pages).

Pixeline's Email Protector vs Email JavaScript Cloak