These FortiMail appliances are proven email security platforms, ideal for small businesses, branch offices, and organizations with fewer than 400 users. Purpose-built for demanding messaging systems, FortiMail appliances protect networks against spam, malware, and other message-borne threats. They prevent your email systems from becoming threat delivery systems. The inbound filtering engine blocks spam and malware before it can clog your network and affect users. The outbound inspection technology prevents other antispam gateways from blacklisting your users by blocking outbound spam and malware, including mobile traffic.