Does it make sense to track how many valid & invalid addresses are provided for 
a message, and allow a threshold to consider that spam?

Although not as frequently as in the past, I still see messages coming in with 
dictionary attacks, e.g.,

   RCPT <[EMAIL PROTECTED]>
   RCPT <[EMAIL PROTECTED]>
   RCPT <[EMAIL PROTECTED]>
   RCPT <[EMAIL PROTECTED]>

and perhaps one of those happens to have a hit.  It might be nice to reject it 
because all of the others failed.

        --- Noel



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