ASSP (Anti Spam Smtp Proxy) is installed on Storm Web servers to effectively combat spam. ASSP includes RBL, Bayesian filter, HELO, SPF, PTR, MX & A record checks, an advanced Penalty box, Delaying (greylisting) filter, URIBL , BombRe, automatic whitelisting, SPAM Scoring mode, ClamAV antivirus integration, SPAM reports, and much more. ASSP is considered to be the absolute best SPAM and VIRUS fighting system.