| 摘要 |
A technical system in the firmware/kernel to protect mail gateways against overload- and downtime-situations, most notably against DDoS-attacks, without redirecting, tagging, modifying and directly blocking any SMTP-connections in connection with a IP-address based whitelist. The system only affects the smtp protocol and protocols based on top of the SMTP protocol like SMTPS. Heavy load situations caused by those DDoS attacks, or many simultaneous connections from different originating IP-addresses accessing software/hardware at the same time, can lead to software or hardware deadlocks or to very slow unresponsive reply times of the underlying operation system (OS) and the software running within the operating system.
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