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Lexur - 6:39 am on Dec 27, 2006 (gmt 0)
If he/she is a "human", add some words of his URL/URLs to the invalid words list of your forum. You can't do anything against a spammer (not a bot) but delete the posts once and again. Finally you'll win the battle; be patient. [edited by: Lexur at 6:41 am (utc) on Dec. 27, 2006]
Are you sure it's not a bot? What's your forum software? Do you have any kind of spam prevention?