Note: Requires WordPress 3.6 or higher

This plugin simply removes:

1. The Website URL Field From All Comment Forms.
2. ALL Comment Form Allowed Tags Which Attract Automated Comment Form Spam.
3. The 'Your email address will not be published' text which also attracts comment form bots because it includes the text 'email'.

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Learn more about how to remove comment form allowed tags

Note: Requires WordPress 3.6 or higher

This plugin is simple to install:

1. Download zip
2. Unzip
3. Upload stop-comment-form-spam directory to your /wp-content/plugins directory
4. Go to your WordPress Dashboard > Appearance > Plugins and enable the plugin

Thats it.

You'll find comment form spam should be greatly reduced

Website URL Field & Allowed Tags Removed From Comments Form