WP Emailcrypt
Latest stable version.
WP EmailCrypt is a simple WordPress plugin that protects email links from spam bots. There’s no guarantee, but I would bet on your email remaining safe. This is a perfect plugin when you must link to an email in your WordPress site, or if WordPress is being managed by someone who does not understand the dangers of posting a naked email link.
As you can see, this plugin provides a high level of protection against spam bots and email harvesters.
View official WordPress plugin page for Wp-EmailCrypt.

Changelog
- Version 0.1
- Initial Release.
- Disabled one algorithm that was breaking the script.
- Version 0.2
- Added shortcode API support.
- Version 0.2.1
- Updated shortcode tag so it would not conflict with other plugins.

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