" I have blackice set up to automatically block the IP address after 3 attempts at non-existing email accounts.  The IP is blocked for 1 hour and then the block goes away. "
 
We set up BlackIce on our server prior to moving to a postfix gateway, but with (at that time) 200,000+ invalid user requests per day, BlackIce on its own was taking up too much of the server's resources.  We tried tuning the settings etc, but ended up having to remove it from the server because it, like Imail itself, just couldn't keep up with the barrage. 
 
Dan Horne

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