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[fred at cisco.com (Fred Baker)]

On Jun 15, 2009, at 1:16 PM, Quinn Mahoney wrote:

> Or use this script which null routes the traffic (I guess it's not a  
> big deal getting the syn packets, as long as the mail won't send  
> because of the null route)

I you are using uRPF, the SYN packets won't get through either,  
because they came from an interface other than the null interface. Not  
so helpful interddomain, but it protects your customers from each  
other (as BCP 38 does in other cases).