Damping at anti-spam gateway

SMTP protocol lacks of many necessary authentication regulations and the behavioral restrictions to the senders, which is the reasons that cause the spread of spam. At present, spam has making billions of money loss. For these reasons, combined with our current anti-spam gateway and network transport protocols, in this paper we propose a damping approach, in order to inhibit the efficiency of the spammers. We propose two measures to achieve the goal, one is delaying the data packets which is deliveries to recipient, the other is directly drop the last packet of the mail to force the sender to retransmit. At last, we make the conclusion that, by the simulative experiments, the gateway which using the two measures surely can effectively reduce the suspicious sender's throughout.