I'm running version 8.05.  Does anyone know how to disable auto-responders and bounces for invalid users?
 
I've found that spammers will send a million spam messages to a single [EMAIL PROTECTED] with the FROM address as the real recipient.  Our mail server then bounces the message because the person in the TO field doesn't exist.  The bounced message is then "returned" to the person in the FROM address and they receive a spam message saying "unknown user" and the spam content.  All the while, the spammer used our mail server to "relay" from and we get blacklisted. 
 
I need to drop those messages that result in an "unknown user" result.  Can that be done with this version?
 
Thanks for any help!
Adam Winter
Security Labs

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