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On 11.1.2011 21:24, Mauricio Tavares wrote:
> Am I correct? What would stop someone from trying to fake the
> originating IP to fit the ones in the above list?
If I am not mistaken, the IP protocol and SMTP. Someone might fake the
address when sending to you MTA, but your MTA's response would go to
wrong address, the fake one. There would be no session and talk between
the hosts to create a SPAM.
-- You single-handedly fought your way into this hopeless mess.