postfix针对所有的并发和总共的连接频率控制做法参考
echo "1" > /proc/sys/net/ipv4/tcp_syncookies<br><br>
iptables -A INPUT -m limit --limit 100/second --limit-burst 200 \<br>-j ACCEPT<br>
<br>
# But 100/second is still too high and not necessary. Recommend to <br>
# lower to 10/s
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