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

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.

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