> I understand that when the spammer send an email to an invalid user , 
> assp returns an email to the sender .
> And if the sender does not exist I receive the "Delivery Status 
> Notification (Failure)" email .
> How to reduce these ? assp can help on this ?

We discussed it a little on assp-test. It's called backscatter and it's a
well know spam problem. Here you can find some suggestions
http://www.postfix.org/BACKSCATTER_README.html

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