Lorelle on WP: Fighting Registration Spam in WordPress

"Most WordPress blogs are protected by the best anti-spam triangle of comment spam defenders: Bad Behavior, Spam Karma 2 and Akismet.

However, little or nothing is available to help prevent registration spam.

Registration spam differs from comment spam as it comes through the WordPress login form, not blog comments. WordPress blogs which require registration to comment, contribute, or participate have little or no protection from spammers hammering away at their registration forms."

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