Ah, I see now. I received the "boilerplate" email and assumed that came 
directly from ASSP.  But yea, it doesn't... came from the sending ISP. 
Thanks for clearing that up.

Micheal Espinola Jr wrote:
> Paul Houlbrooke wrote:
>> In this case, isn't ASSP guilty of backscatter? It sends an error 
>> message to the sending user when the receiving user does not exist. Or 
>> do I something misconfigured?
> 
> You are confusing terminology.  Yes, ASSP sends a "message" back to the
> sending server, but its not an email. Its an SMTP Reply code (3 digit
> number) with a verbose description following it.  The sending server
> will then send a boilerplate email  message to the sending user based on
> the reply code it received when attempting to send the email.  The
> boilerplate email to the sending user is called a DSN - Delivery Status
> Notification.
> 
> The receiving server should not be sending the *email* message.  That
> should be done by the local sending server.  Anything else is easily
> abused as backscatter.
> 
> ASSP handles all of this correctly and does not contribute to backscatter.
> 
> http://www.asspsmtp.org/wiki/SMTP_Status_Codes#Example_DSN
> 
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