Hello, 

Derrick writes: 

> Any drawbacks?

There is only one major drawback that I'm aware of - delayed mail.  The best 
approach I have found is to keep the time that a message is gray listed very 
low and keep a good sized cache to mitigate the delay for well behaving 
systems.  Also, a whitelist is a way to skip the process altogether for 
trusted systems. 

 --- 

DynaStop: Stopping spam one dynamic IP address at a time.
http://tanaya.net/DynaStop/

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