Arefly

Disallow Chinese Comments in Your Blog. (Full Support with AJAX Comments Too!)
在你的部落格中禁止中文評論（? ?面支持AJAX評論提示）
<h4>Translators</h4>
<ul>
<li>Chinese, Simplified (zh_CN) – <a href="http://www.arefly.com/" rel="nofollow ugc">Arefly</a></li>
<li>Chinese, Traditional (zh_TW) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
<li>English (en_US) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">gettext PO and MO files</a> to <a href="http://www.arefly.com/about/" rel="nofollow ugc">Arefly</a> so that I can bundle it into No Chinese Comments. You can download the latest <a href="https://plugins.svn.wordpress.org/no-chinese-comments/trunk/lang/no-chinese-comments.pot" rel="nofollow ugc">POT file</a>.

No Chinese Comments

Disallow Chinese Comments in Your Blog. 在你的部落格中禁止中文評論

MoeHassan

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It converts every email written within your post body into a JavaScript code, so the emails is readable and can be clicked by humans only.
Spammers can’t crawl JavaScript.

WP Email Guard

WP Email Guard protects your email addresses included on any post or page from being crawled by spammers.

No Chinese Comments vs WP Email Guard