How to Whitelist Comments in WordPress

Out-of-the-box, WordPress provides the ability to blacklist comments or configure a set of options to send comments to moderation. If all comments are moderated, there are no options to whitelist comments.
Searching the plugin directory for comment whitelisting provides few, if any, solutions. However, a cursory search of Google led me to the Comment Whitelist plugin by Alejandro Carravedo.
Comment Whitelist Box
Comment Whitelist adds a ‘Put in Whitelist’ quick moderation link to comments that makes adding email addresses to the list an easy task....

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