> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED]] 
> Sent: 10 January 2002 19:37
> To: Exchange Discussions
> Subject: Different kind of spam fighter
> 
> 
> Somewhere in the back of my brain, I remember seeing a tool 
> that you could run on received spam that would simulate a NDR 
> back to the sender, pretending that the email address was invalid.  
> 
> Does anyone know of such a tool and how effective it might or 
> might not be?

Well I use the MAPS RBL for that but that's probably not the kind of tool
you were talking about. Works ok though.

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