Tyran Ormond wrote:
> ASSP responds to the server with a "500 Mail 
> appears to be unsolicited" only, it does not 
> generate an actual message.  When the sending 
> server receives the 500 error line, it may or may 
> not generate a postmaster message to be sent back 
> to the sender.  If the sending user gets any 
> bounce message, that message was generated by the 
> *sending* server and *not* by ASSP.

The key fact is that ASSP [appropriately] responds with a DSN (Delivery
Status Notification) via an SMTP Status/Reply Code:

   http://www.asspsmtp.org/wiki/SMTP_Status_Codes

"Backscatter" is when the response is done via an NDR (Non-Delivery
Report) via an  email message (aka "bounce" message).






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