AntiAbuse
Multiple techniques to allow legitimate mail in while preventing unauthorized access - all configurable on a per-domain basis.
Relay Control
Prohibits messages from being accepted or delivered if they are not to or from a local domain.
SMTP Authentication
SMTP authentication can be required - to ensure that the identity of message senders is known.
IP Shielding
Allows SecurityGateway to only accept mail from a domain if it matches a pre-defined domain/IP pair.
Dynamic Screening and DDoS
Bans senders based on their suspicious activity and prevents Distributed Denial of Service (DDoS) attacks. Dynamic Screening for failed SMTP authentication attempts work across sessions over time. The failed authentication count for an IP is reset at midnight, or when it is blocked and added to the Dynamic Screening list.
Location Screening
SecurityGateway's Location Screening feature allows administrators to block incoming SMTP and remote administration connections from unauthorized countries. Exceptions can be made for connections from whitelisted IP addresses.
Tarpitting
Deliberately slows down sessions after a specified number of RCPT commands, to prevent abuse from a suspected spammer or bot.