--- ./2.5.1/wp-includes/comment.php	2008-04-17 00:10:20.000000000 +0000
+++ ./wp-includes/comment.php	2008-05-28 11:29:08.000000000 +0000
@@ -354,7 +354,7 @@
 		else
 			$approved = 0;
 		if ( wp_blacklist_check($comment_author, $comment_author_email, $comment_author_url, $comment_content, $comment_author_IP, $comment_agent) )
-			$approved = 'spam';
+			$approved = 'blacklist';
 	}
 
 	$approved = apply_filters('pre_comment_approved', $approved);
@@ -689,11 +689,12 @@
 
 	$commentdata['comment_approved'] = wp_allow_comment($commentdata);
 
-	$comment_ID = wp_insert_comment($commentdata);
+	if ( 'blacklist' !== $commentdata['comment_approved'] )
+		$comment_ID = wp_insert_comment($commentdata);
 
 	do_action('comment_post', $comment_ID, $commentdata['comment_approved']);
 
-	if ( 'spam' !== $commentdata['comment_approved'] ) { // If it's spam save it silently for later crunching
+	if ( 'blacklist' !== $commentdata['comment_approved'] && 'spam' !== $commentdata['comment_approved'] ) { // If it's spam or blacklisted don't notify anyone
 		if ( '0' == $commentdata['comment_approved'] )
 			wp_notify_moderator($comment_ID);