[SOLVED] Using the IPBanning Module to check email addresses...

                  // Add $remoteip to placeholder 
	if(!strstr($tpl,'[+remoteip+]'))
		$fields['remoteip'] = str_replace('[+remoteip+]', 'IP:', $remoteip);



	if ($eFormOnValidate) {
	    		//Check banned IPs
			$banipres = $modx->db->select('ip', $modx->getFullTableName('banip'),"ip='".$remoteip."'");
			$baniprows = mysql_num_rows($banipres);
			if ($baniprows > 0){
				$url = $modx->makeURL('11');  // Please note put your resource id... in here!
				$modx->sendRedirect($url); // return 'The Banned Email list!'; //we have a match - this email is banned
				}

			//Check banned emails
			$banemailres = $modx->db->select('email', $modx->getFullTableName('banemail'),"email='".$fields['email']."'");
			$banrows = mysql_num_rows($banemailres);
			if ($banrows > 0){
				$url = $modx->makeURL('11');  Please note put your resource id... in here!
				$modx->sendRedirect($url); // return 'The Banned Email list!'; //we have a match - this email is banned
				}
			}

#first, block bad bots
RewriteCond %{HTTP_USER_AGENT} libwww-perl.*
RewriteRule .* - [F,L]

RewriteCond %{QUERY_STRING} snippet\.reflect\.php [NC,OR]
RewriteCond %{QUERY_STRING} reflect_base [NC,OR]
RewriteCond %{QUERY_STRING} (.*)(http|https|ftp):\/\/(.*) [NC]
RewriteCond %{HTTP_USER_AGENT} ^libwww-perl [NC]
RewriteRule .* - [F,L]