Tibor Paulsch

Adds a button to the TinyMCE editor that puts a selected email address into a shortcode [email] and turns it into a mailto-link, which uses WordPress’ native antispambot() function to encode the emailadress so harvesters can’t get it. 
This is my very first public plugin, so please be gentle with your comments 😉
Find it on <a href="https://github.com/tiborp/email-shortcode-button" title="Plugin code on GitHub" rel="nofollow ugc">GitHub</a>

Anti SpamBot Email Button

Adds a shortcode button to the WordPress TinyMCE editor for easy anti spambot email links.

Ralf Weber

No more SPAM by spiders scanning your site for email addresses. With CryptX you can hide all your email addresses, with and without a mailto-link, by converting them using javascript or UNICODE.
CryptX protects your email addresses from spambots while keeping them readable and functional for your visitors. The plugin automatically detects email addresses in your content and encrypts them using various methods including JavaScript encryption, Unicode conversion, and image replacement.
Key Features:
<ul>
<li>Automatic Email Detection – Finds and encrypts email addresses in posts, pages, comments, and widgets</li>
<li>Multiple Encryption Methods – JavaScript, Unicode, image replacement, and custom text options</li>
<li>Widget Support – Works with text widgets and other widget content</li>
<li>RSS Feed Control – Option to disable encryption in RSS feeds</li>
<li>Whitelist Support – Exclude specific domains from encryption</li>
<li>Per-Post Control – Enable/disable encryption on individual posts and pages</li>
<li>Shortcode Support – Use <code>[cryptx]email@example.com[/cryptx]</code> for manual encryption</li>
<li>Template Functions – Developer-friendly functions for theme integration</li>
</ul>
<a href="http://weber-nrw.de/wordpress/cryptx/" title="Plugin Homepage" rel="nofollow ugc">Plugin Homepage</a>

CryptX

No more SPAM by spiders scanning your site for email addresses!

Anti SpamBot Email Button vs CryptX