Zar, read a book about common sense, that is obviously very unefficient(sp)
You would have to log all instances of a hack being detected, skim through them, take out the single offenders, people that were detected 2-3 times will be banned.
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I dont know how its done, but it is possible, i made a forum via my personal web hosting, and the test email came from '[email protected]' which was obviously wrong.