Anti-Virus
Provide ICSA-compliant anti-virus engines (optional) to filter out mail traffic.
Anti-Spyware
Provide a WebCoastLabs-compliant engine which passes 100% on Spyware testing.
Anti-Phishing
Protect users from clicking links inside spam mails which lead to phishing websites.
Anti-Relay
Prevent spammers from using your computer to relay their mails; via Open Relay.
Anti-DoS
Prevent DoS (denial of service) attacks; or inadvertent spreading of viruses which would bring down your system.
Anti-Hacking
Prevent hackers from getting past the firewall through SMTP security holes to install a Trojan horse virus.