[Exim] RBL and reducing spam.

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I was wondering,

Since the hosts trying to spam get rejected because they are the RBL's they still keep the email on file in case they switch to a new IP or a different means of spamming.

Is there a way to send them a message that looks like the user does not exist, this way some may remove the email automaticlly from the list.


Rejecting the host doest seem to make a long term effect of actually reducing the sent (not recieved) spam.


Any thoughts on this matter?


Oren.

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