If we knew that all outbound email went through ASSP (no relaying) then 
one might be able to compare the recipient on backscatter messages to 
the recipient on messages actually sent out, which would be one way of 
"verifying" backscatter messages. Unfortunately message IDs and other 
things we put in the headers aren't going to come back to us on the 
rebound, so those are useless.

Marrco wrote:
>> 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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