You can use, also, fail2ban http://www.fail2ban.org/wiki/index.php/Sendmail http://www.fail2ban.org/wiki/index.php/HOWTOs Work over the filter. You can set that if 'x' connection from same IP in 'y' seconds, block in firewall -- Diego - Yo no soy paranoico! (pero que me siguen, me siguen)