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Highlight comments with a background color in the WordPress Comments Admin pages. Choose the criteria for highlighting a comment, add a note to show it with, and pick the highlight color.
This plugin is “for internal use” and only highlights comments within the WordPress Comments admin. The typical use case for this plugin is to inform/remind users about what to do for a particular type of comment. Examples:
<ul>
<li>
Comments from John Doe – Always approve unless it’s about topic XYZ
</li>
<li>
Comments from IP 12.34.56.78 – Give a personal, non-standard response to these comments
</li>
</ul>
You can highlight a comment based on the contents of the commentor’s name, email, or IP address.

Comment Moderation Highlights

Highlight comments in the Comments Admin. Pick a color, add a note.

Andrew Nacin

Comment Probation allows you to put a comment author on “probation.”
If you allow comments to automatically appear from authors who already have an approved comment, 
this plugin gives you a bit more control. It lets you approve a comment but place the author 
under probation, meaning that any future comments from that author will need to be moderated again.
When approving a comment, you’re given the option to “Approve” the comment, or “Approve with Probation.” 
If a comment ended up in moderation because the author is on probation, “approving” the comment will 
remove the author from the probation list.

Comment Probation

Comment Probation allows you to require moderation for a future comment by a comment author, rather than having the comment be automatically approved.

Comment Moderation Highlights vs Comment Probation