J.R. Lillard wrote on 2012-09-02 00:30:
> Iptables was my first thought but half a million ips seemed like too
> much for it.  How many rules have you had with your script?

IPs are part of classes. If you i.e. got no legit users from certain 
class, nor your logs do not show any legit mails comming from certain 
class, ban whole class C and even B and further when needed. Let users
know you are fighting DDOS, so they will be aware of some sacrifices.

Regards,
-- 
"Daddy, what "Formatting drive C:" means?"...

Marcin             http://wfmh.org.pl/carlos/
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